4x-9=81

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Solution for 4x-9=81 equation: 


Simplifying
4x + -9 = 81

Reorder the terms:
-9 + 4x = 81

Solving
-9 + 4x = 81

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 4x = 81 + 9

Combine like terms: -9 + 9 = 0
0 + 4x = 81 + 9
4x = 81 + 9

Combine like terms: 81 + 9 = 90
4x = 90

Divide each side by '4'.
x = 22.5

Simplifying
x = 22.5

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