129=6x+4x+9

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Solution for 129=6x+4x+9 equation:


Simplifying
129 = 6x + 4x + 9

Reorder the terms:
129 = 9 + 6x + 4x

Combine like terms: 6x + 4x = 10x
129 = 9 + 10x

Solving
129 = 9 + 10x

Solving for variable 'x'.

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

Add '-10x' to each side of the equation.
129 + -10x = 9 + 10x + -10x

Combine like terms: 10x + -10x = 0
129 + -10x = 9 + 0
129 + -10x = 9

Add '-129' to each side of the equation.
129 + -129 + -10x = 9 + -129

Combine like terms: 129 + -129 = 0
0 + -10x = 9 + -129
-10x = 9 + -129

Combine like terms: 9 + -129 = -120
-10x = -120

Divide each side by '-10'.
x = 12

Simplifying
x = 12

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