6x+129=12x-9

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Solution for 6x+129=12x-9 equation:


Simplifying
6x + 129 = 12x + -9

Reorder the terms:
129 + 6x = 12x + -9

Reorder the terms:
129 + 6x = -9 + 12x

Solving
129 + 6x = -9 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
129 + 6x + -12x = -9 + 12x + -12x

Combine like terms: 6x + -12x = -6x
129 + -6x = -9 + 12x + -12x

Combine like terms: 12x + -12x = 0
129 + -6x = -9 + 0
129 + -6x = -9

Add '-129' to each side of the equation.
129 + -129 + -6x = -9 + -129

Combine like terms: 129 + -129 = 0
0 + -6x = -9 + -129
-6x = -9 + -129

Combine like terms: -9 + -129 = -138
-6x = -138

Divide each side by '-6'.
x = 23

Simplifying
x = 23

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