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(3x+15)+(2x+30)+90=180
We move all terms to the left:
(3x+15)+(2x+30)+90-(180)=0
We add all the numbers together, and all the variables
(3x+15)+(2x+30)-90=0
We get rid of parentheses
3x+2x+15+30-90=0
We add all the numbers together, and all the variables
5x-45=0
We move all terms containing x to the left, all other terms to the right
5x=45
x=45/5
x=9
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