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(3x+30)+(2x+15)=180
We move all terms to the left:
(3x+30)+(2x+15)-(180)=0
We get rid of parentheses
3x+2x+30+15-180=0
We add all the numbers together, and all the variables
5x-135=0
We move all terms containing x to the left, all other terms to the right
5x=135
x=135/5
x=27
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