84=3x-9

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Solution for 84=3x-9 equation:


Simplifying
84 = 3x + -9

Reorder the terms:
84 = -9 + 3x

Solving
84 = -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.
84 + -3x = -9 + 3x + -3x

Combine like terms: 3x + -3x = 0
84 + -3x = -9 + 0
84 + -3x = -9

Add '-84' to each side of the equation.
84 + -84 + -3x = -9 + -84

Combine like terms: 84 + -84 = 0
0 + -3x = -9 + -84
-3x = -9 + -84

Combine like terms: -9 + -84 = -93
-3x = -93

Divide each side by '-3'.
x = 31

Simplifying
x = 31

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