-81-8x=9x+21

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Solution for -81-8x=9x+21 equation:


Simplifying
-81 + -8x = 9x + 21

Reorder the terms:
-81 + -8x = 21 + 9x

Solving
-81 + -8x = 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.
-81 + -8x + -9x = 21 + 9x + -9x

Combine like terms: -8x + -9x = -17x
-81 + -17x = 21 + 9x + -9x

Combine like terms: 9x + -9x = 0
-81 + -17x = 21 + 0
-81 + -17x = 21

Add '81' to each side of the equation.
-81 + 81 + -17x = 21 + 81

Combine like terms: -81 + 81 = 0
0 + -17x = 21 + 81
-17x = 21 + 81

Combine like terms: 21 + 81 = 102
-17x = 102

Divide each side by '-17'.
x = -6

Simplifying
x = -6

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