18-10x+10(3x+4+3x)-20+1x(2x-12+3x)=0

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Solution for 18-10x+10(3x+4+3x)-20+1x(2x-12+3x)=0 equation:


Simplifying
18 + -10x + 10(3x + 4 + 3x) + -20 + 1x(2x + -12 + 3x) = 0

Reorder the terms:
18 + -10x + 10(4 + 3x + 3x) + -20 + 1x(2x + -12 + 3x) = 0

Combine like terms: 3x + 3x = 6x
18 + -10x + 10(4 + 6x) + -20 + 1x(2x + -12 + 3x) = 0
18 + -10x + (4 * 10 + 6x * 10) + -20 + 1x(2x + -12 + 3x) = 0
18 + -10x + (40 + 60x) + -20 + 1x(2x + -12 + 3x) = 0

Reorder the terms:
18 + -10x + 40 + 60x + -20 + 1x(-12 + 2x + 3x) = 0

Combine like terms: 2x + 3x = 5x
18 + -10x + 40 + 60x + -20 + 1x(-12 + 5x) = 0
18 + -10x + 40 + 60x + -20 + (-12 * 1x + 5x * 1x) = 0
18 + -10x + 40 + 60x + -20 + (-12x + 5x2) = 0

Reorder the terms:
18 + 40 + -20 + -10x + 60x + -12x + 5x2 = 0

Combine like terms: 18 + 40 = 58
58 + -20 + -10x + 60x + -12x + 5x2 = 0

Combine like terms: 58 + -20 = 38
38 + -10x + 60x + -12x + 5x2 = 0

Combine like terms: -10x + 60x = 50x
38 + 50x + -12x + 5x2 = 0

Combine like terms: 50x + -12x = 38x
38 + 38x + 5x2 = 0

Solving
38 + 38x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
7.6 + 7.6x + x2 = 0

Move the constant term to the right:

Add '-7.6' to each side of the equation.
7.6 + 7.6x + -7.6 + x2 = 0 + -7.6

Reorder the terms:
7.6 + -7.6 + 7.6x + x2 = 0 + -7.6

Combine like terms: 7.6 + -7.6 = 0.0
0.0 + 7.6x + x2 = 0 + -7.6
7.6x + x2 = 0 + -7.6

Combine like terms: 0 + -7.6 = -7.6
7.6x + x2 = -7.6

The x term is 7.6x.  Take half its coefficient (3.8).
Square it (14.44) and add it to both sides.

Add '14.44' to each side of the equation.
7.6x + 14.44 + x2 = -7.6 + 14.44

Reorder the terms:
14.44 + 7.6x + x2 = -7.6 + 14.44

Combine like terms: -7.6 + 14.44 = 6.84
14.44 + 7.6x + x2 = 6.84

Factor a perfect square on the left side:
(x + 3.8)(x + 3.8) = 6.84

Calculate the square root of the right side: 2.615339366

Break this problem into two subproblems by setting 
(x + 3.8) equal to 2.615339366 and -2.615339366.

Subproblem 1

x + 3.8 = 2.615339366 Simplifying x + 3.8 = 2.615339366 Reorder the terms: 3.8 + x = 2.615339366 Solving 3.8 + x = 2.615339366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.8' to each side of the equation. 3.8 + -3.8 + x = 2.615339366 + -3.8 Combine like terms: 3.8 + -3.8 = 0.0 0.0 + x = 2.615339366 + -3.8 x = 2.615339366 + -3.8 Combine like terms: 2.615339366 + -3.8 = -1.184660634 x = -1.184660634 Simplifying x = -1.184660634

Subproblem 2

x + 3.8 = -2.615339366 Simplifying x + 3.8 = -2.615339366 Reorder the terms: 3.8 + x = -2.615339366 Solving 3.8 + x = -2.615339366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.8' to each side of the equation. 3.8 + -3.8 + x = -2.615339366 + -3.8 Combine like terms: 3.8 + -3.8 = 0.0 0.0 + x = -2.615339366 + -3.8 x = -2.615339366 + -3.8 Combine like terms: -2.615339366 + -3.8 = -6.415339366 x = -6.415339366 Simplifying x = -6.415339366

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.184660634, -6.415339366}

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