81=3x-9

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Solution for 81=3x-9 equation:


Simplifying
81 = 3x + -9

Reorder the terms:
81 = -9 + 3x

Solving
81 = -9 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
81 + -3x = -9 + 3x + -3x

Combine like terms: 3x + -3x = 0
81 + -3x = -9 + 0
81 + -3x = -9

Add '-81' to each side of the equation.
81 + -81 + -3x = -9 + -81

Combine like terms: 81 + -81 = 0
0 + -3x = -9 + -81
-3x = -9 + -81

Combine like terms: -9 + -81 = -90
-3x = -90

Divide each side by '-3'.
x = 30

Simplifying
x = 30

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