13x+21=4x+129

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Solution for 13x+21=4x+129 equation:


Simplifying
13x + 21 = 4x + 129

Reorder the terms:
21 + 13x = 4x + 129

Reorder the terms:
21 + 13x = 129 + 4x

Solving
21 + 13x = 129 + 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.
21 + 13x + -4x = 129 + 4x + -4x

Combine like terms: 13x + -4x = 9x
21 + 9x = 129 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + 9x = 129 + 0
21 + 9x = 129

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

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

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

Divide each side by '9'.
x = 12

Simplifying
x = 12

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