3(x-5)2x=5x-15

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Solution for 3(x-5)2x=5x-15 equation:


Simplifying
3(x + -5) * 2x = 5x + -15

Reorder the terms:
3(-5 + x) * 2x = 5x + -15

Reorder the terms for easier multiplication:
3 * 2x(-5 + x) = 5x + -15

Multiply 3 * 2
6x(-5 + x) = 5x + -15
(-5 * 6x + x * 6x) = 5x + -15
(-30x + 6x2) = 5x + -15

Reorder the terms:
-30x + 6x2 = -15 + 5x

Solving
-30x + 6x2 = -15 + 5x

Solving for variable 'x'.

Reorder the terms:
15 + -30x + -5x + 6x2 = -15 + 5x + 15 + -5x

Combine like terms: -30x + -5x = -35x
15 + -35x + 6x2 = -15 + 5x + 15 + -5x

Reorder the terms:
15 + -35x + 6x2 = -15 + 15 + 5x + -5x

Combine like terms: -15 + 15 = 0
15 + -35x + 6x2 = 0 + 5x + -5x
15 + -35x + 6x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
15 + -35x + 6x2 = 0

Begin completing the square.  Divide all terms by
6 the coefficient of the squared term: 

Divide each side by '6'.
2.5 + -5.833333333x + x2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -5.833333333x + -2.5 + x2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -5.833333333x + x2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -5.833333333x + x2 = 0 + -2.5
-5.833333333x + x2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-5.833333333x + x2 = -2.5

The x term is -5.833333333x.  Take half its coefficient (-2.916666667).
Square it (8.506944446) and add it to both sides.

Add '8.506944446' to each side of the equation.
-5.833333333x + 8.506944446 + x2 = -2.5 + 8.506944446

Reorder the terms:
8.506944446 + -5.833333333x + x2 = -2.5 + 8.506944446

Combine like terms: -2.5 + 8.506944446 = 6.006944446
8.506944446 + -5.833333333x + x2 = 6.006944446

Factor a perfect square on the left side:
(x + -2.916666667)(x + -2.916666667) = 6.006944446

Calculate the square root of the right side: 2.450906862

Break this problem into two subproblems by setting 
(x + -2.916666667) equal to 2.450906862 and -2.450906862.

Subproblem 1

x + -2.916666667 = 2.450906862 Simplifying x + -2.916666667 = 2.450906862 Reorder the terms: -2.916666667 + x = 2.450906862 Solving -2.916666667 + x = 2.450906862 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.916666667' to each side of the equation. -2.916666667 + 2.916666667 + x = 2.450906862 + 2.916666667 Combine like terms: -2.916666667 + 2.916666667 = 0.000000000 0.000000000 + x = 2.450906862 + 2.916666667 x = 2.450906862 + 2.916666667 Combine like terms: 2.450906862 + 2.916666667 = 5.367573529 x = 5.367573529 Simplifying x = 5.367573529

Subproblem 2

x + -2.916666667 = -2.450906862 Simplifying x + -2.916666667 = -2.450906862 Reorder the terms: -2.916666667 + x = -2.450906862 Solving -2.916666667 + x = -2.450906862 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.916666667' to each side of the equation. -2.916666667 + 2.916666667 + x = -2.450906862 + 2.916666667 Combine like terms: -2.916666667 + 2.916666667 = 0.000000000 0.000000000 + x = -2.450906862 + 2.916666667 x = -2.450906862 + 2.916666667 Combine like terms: -2.450906862 + 2.916666667 = 0.465759805 x = 0.465759805 Simplifying x = 0.465759805

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.367573529, 0.465759805}

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