3x+129=12x-6

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Solution for 3x+129=12x-6 equation:


Simplifying
3x + 129 = 12x + -6

Reorder the terms:
129 + 3x = 12x + -6

Reorder the terms:
129 + 3x = -6 + 12x

Solving
129 + 3x = -6 + 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 + 3x + -12x = -6 + 12x + -12x

Combine like terms: 3x + -12x = -9x
129 + -9x = -6 + 12x + -12x

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

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

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

Combine like terms: -6 + -129 = -135
-9x = -135

Divide each side by '-9'.
x = 15

Simplifying
x = 15

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