-129-8x=7x+21

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Solution for -129-8x=7x+21 equation:


Simplifying
-129 + -8x = 7x + 21

Reorder the terms:
-129 + -8x = 21 + 7x

Solving
-129 + -8x = 21 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
-129 + -8x + -7x = 21 + 7x + -7x

Combine like terms: -8x + -7x = -15x
-129 + -15x = 21 + 7x + -7x

Combine like terms: 7x + -7x = 0
-129 + -15x = 21 + 0
-129 + -15x = 21

Add '129' to each side of the equation.
-129 + 129 + -15x = 21 + 129

Combine like terms: -129 + 129 = 0
0 + -15x = 21 + 129
-15x = 21 + 129

Combine like terms: 21 + 129 = 150
-15x = 150

Divide each side by '-15'.
x = -10

Simplifying
x = -10

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