9x-81=90

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Solution for 9x-81=90 equation: 


Simplifying
9x + -81 = 90

Reorder the terms:
-81 + 9x = 90

Solving
-81 + 9x = 90

Solving for variable 'x'.

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

Add '81' to each side of the equation.
-81 + 81 + 9x = 90 + 81

Combine like terms: -81 + 81 = 0
0 + 9x = 90 + 81
9x = 90 + 81

Combine like terms: 90 + 81 = 171
9x = 171

Divide each side by '9'.
x = 19

Simplifying
x = 19

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