(12x+9)+(9x+3)=180

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Solution for (12x+9)+(9x+3)=180 equation: 



(12x+9)+(9x+3)=180

We move all terms to the left:

(12x+9)+(9x+3)-(180)=0

We get rid of parentheses

12x+9x+9+3-180=0

We add all the numbers together, and all the variables

21x-168=0

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

21x=168

x=168/21

x=8

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