7x(x+3)=5x+15

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Solution for 7x(x+3)=5x+15 equation: 


Simplifying
7x(x + 3) = 5x + 15

Reorder the terms:
7x(3 + x) = 5x + 15
(3 * 7x + x * 7x) = 5x + 15
(21x + 7x2) = 5x + 15

Reorder the terms:
21x + 7x2 = 15 + 5x

Solving
21x + 7x2 = 15 + 5x

Solving for variable 'x'.

Reorder the terms:
-15 + 21x + -5x + 7x2 = 15 + 5x + -15 + -5x

Combine like terms: 21x + -5x = 16x
-15 + 16x + 7x2 = 15 + 5x + -15 + -5x

Reorder the terms:
-15 + 16x + 7x2 = 15 + -15 + 5x + -5x

Combine like terms: 15 + -15 = 0
-15 + 16x + 7x2 = 0 + 5x + -5x
-15 + 16x + 7x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-15 + 16x + 7x2 = 0

Factor a trinomial.
(-3 + -1x)(5 + -7x) = 0


Subproblem 1
Set the factor '(-3 + -1x)' equal to zero and attempt to solve:

Simplifying
-3 + -1x = 0

Solving
-3 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '3' to each side of the equation.
-3 + 3 + -1x = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1x = 0 + 3
-1x = 0 + 3

Combine like terms: 0 + 3 = 3
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3

Subproblem 2
Set the factor '(5 + -7x)' equal to zero and attempt to solve:

Simplifying
5 + -7x = 0

Solving
5 + -7x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-5' to each side of the equation.
5 + -5 + -7x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -7x = 0 + -5
-7x = 0 + -5

Combine like terms: 0 + -5 = -5
-7x = -5

Divide each side by '-7'.
x = 0.7142857143

Simplifying
x = 0.7142857143
Solution
x = {-3, 0.7142857143}

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