81-5x=4x-9

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Solution for 81-5x=4x-9 equation:


Simplifying
81 + -5x = 4x + -9

Reorder the terms:
81 + -5x = -9 + 4x

Solving
81 + -5x = -9 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
81 + -5x + -4x = -9 + 4x + -4x

Combine like terms: -5x + -4x = -9x
81 + -9x = -9 + 4x + -4x

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

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

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

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

Divide each side by '-9'.
x = 10

Simplifying
x = 10

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