-8x-15=4x+21

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Solution for -8x-15=4x+21 equation:


Simplifying
-8x + -15 = 4x + 21

Reorder the terms:
-15 + -8x = 4x + 21

Reorder the terms:
-15 + -8x = 21 + 4x

Solving
-15 + -8x = 21 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-15 + -8x + -4x = 21 + 4x + -4x

Combine like terms: -8x + -4x = -12x
-15 + -12x = 21 + 4x + -4x

Combine like terms: 4x + -4x = 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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