(12x-3)+(3x+18)=180

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Solution for (12x-3)+(3x+18)=180 equation: 



(12x-3)+(3x+18)=180

We move all terms to the left:

(12x-3)+(3x+18)-(180)=0

We get rid of parentheses

12x+3x-3+18-180=0

We add all the numbers together, and all the variables

15x-165=0

We move all terms containing x to the left, all other terms to the right

15x=165

x=165/15

x=11

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