129-4x=5x+21

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Solution for 129-4x=5x+21 equation:


Simplifying
129 + -4x = 5x + 21

Reorder the terms:
129 + -4x = 21 + 5x

Solving
129 + -4x = 21 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
129 + -4x + -5x = 21 + 5x + -5x

Combine like terms: -4x + -5x = -9x
129 + -9x = 21 + 5x + -5x

Combine like terms: 5x + -5x = 0
129 + -9x = 21 + 0
129 + -9x = 21

Add '-129' to each side of the equation.
129 + -129 + -9x = 21 + -129

Combine like terms: 129 + -129 = 0
0 + -9x = 21 + -129
-9x = 21 + -129

Combine like terms: 21 + -129 = -108
-9x = -108

Divide each side by '-9'.
x = 12

Simplifying
x = 12

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