-7x-15=5x+21

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Solution for -7x-15=5x+21 equation:


Simplifying
-7x + -15 = 5x + 21

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

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

Solving
-15 + -7x = 21 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
-15 + -7x + -5x = 21 + 5x + -5x

Combine like terms: -7x + -5x = -12x
-15 + -12x = 21 + 5x + -5x

Combine like terms: 5x + -5x = 0
-15 + -12x = 21 + 0
-15 + -12x = 21

Add '15' to each side of the equation.
-15 + 15 + -12x = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -12x = 21 + 15
-12x = 21 + 15

Combine like terms: 21 + 15 = 36
-12x = 36

Divide each side by '-12'.
x = -3

Simplifying
x = -3

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