-87-9x=9x+21

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Solution for -87-9x=9x+21 equation:


Simplifying
-87 + -9x = 9x + 21

Reorder the terms:
-87 + -9x = 21 + 9x

Solving
-87 + -9x = 21 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
-87 + -9x + -9x = 21 + 9x + -9x

Combine like terms: -9x + -9x = -18x
-87 + -18x = 21 + 9x + -9x

Combine like terms: 9x + -9x = 0
-87 + -18x = 21 + 0
-87 + -18x = 21

Add '87' to each side of the equation.
-87 + 87 + -18x = 21 + 87

Combine like terms: -87 + 87 = 0
0 + -18x = 21 + 87
-18x = 21 + 87

Combine like terms: 21 + 87 = 108
-18x = 108

Divide each side by '-18'.
x = -6

Simplifying
x = -6

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