-90=9-9x

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Solution for -90=9-9x equation:


Simplifying
-90 = 9 + -9x

Solving
-90 = 9 + -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.
-90 + 9x = 9 + -9x + 9x

Combine like terms: -9x + 9x = 0
-90 + 9x = 9 + 0
-90 + 9x = 9

Add '90' to each side of the equation.
-90 + 90 + 9x = 9 + 90

Combine like terms: -90 + 90 = 0
0 + 9x = 9 + 90
9x = 9 + 90

Combine like terms: 9 + 90 = 99
9x = 99

Divide each side by '9'.
x = 11

Simplifying
x = 11

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