81-4x=8x+21

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Solution for 81-4x=8x+21 equation:


Simplifying
81 + -4x = 8x + 21

Reorder the terms:
81 + -4x = 21 + 8x

Solving
81 + -4x = 21 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
81 + -4x + -8x = 21 + 8x + -8x

Combine like terms: -4x + -8x = -12x
81 + -12x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
81 + -12x = 21 + 0
81 + -12x = 21

Add '-81' to each side of the equation.
81 + -81 + -12x = 21 + -81

Combine like terms: 81 + -81 = 0
0 + -12x = 21 + -81
-12x = 21 + -81

Combine like terms: 21 + -81 = -60
-12x = -60

Divide each side by '-12'.
x = 5

Simplifying
x = 5

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