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(3x+9)+(2x+4)=180
We move all terms to the left:
(3x+9)+(2x+4)-(180)=0
We get rid of parentheses
3x+2x+9+4-180=0
We add all the numbers together, and all the variables
5x-167=0
We move all terms containing x to the left, all other terms to the right
5x=167
x=167/5
x=33+2/5
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