9-9x=81

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Solution for 9-9x=81 equation: 


Simplifying
9 + -9x = 81

Solving
9 + -9x = 81

Solving for variable 'x'.

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

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

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

Combine like terms: 81 + -9 = 72
-9x = 72

Divide each side by '-9'.
x = -8

Simplifying
x = -8

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