3x+9x-12=180

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Solution for 3x+9x-12=180 equation: 


Simplifying
3x + 9x + -12 = 180

Reorder the terms:
-12 + 3x + 9x = 180

Combine like terms: 3x + 9x = 12x
-12 + 12x = 180

Solving
-12 + 12x = 180

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 12x = 180 + 12

Combine like terms: -12 + 12 = 0
0 + 12x = 180 + 12
12x = 180 + 12

Combine like terms: 180 + 12 = 192
12x = 192

Divide each side by '12'.
x = 16

Simplifying
x = 16

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