90-x=9

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Solution for 90-x=9 equation:


Simplifying
90 + -1x = 9

Solving
90 + -1x = 9

Solving for variable 'x'.

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

Add '-90' to each side of the equation.
90 + -90 + -1x = 9 + -90

Combine like terms: 90 + -90 = 0
0 + -1x = 9 + -90
-1x = 9 + -90

Combine like terms: 9 + -90 = -81
-1x = -81

Divide each side by '-1'.
x = 81

Simplifying
x = 81

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