81=4x+5(-x+18)

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Solution for 81=4x+5(-x+18) equation:


Simplifying
81 = 4x + 5(-1x + 18)

Reorder the terms:
81 = 4x + 5(18 + -1x)
81 = 4x + (18 * 5 + -1x * 5)
81 = 4x + (90 + -5x)

Reorder the terms:
81 = 90 + 4x + -5x

Combine like terms: 4x + -5x = -1x
81 = 90 + -1x

Solving
81 = 90 + -1x

Solving for variable 'x'.

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

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

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

Add '-81' to each side of the equation.
81 + -81 + x = 90 + -81

Combine like terms: 81 + -81 = 0
0 + x = 90 + -81
x = 90 + -81

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

Simplifying
x = 9

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