-81=x+8x

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Solution for -81=x+8x equation:


Simplifying
-81 = x + 8x

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

Solving
-81 = 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 + -9x = 9x + -9x

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

Add '81' to each side of the equation.
-81 + 81 + -9x = 0 + 81

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

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

Divide each side by '-9'.
x = -9

Simplifying
x = -9

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