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(2x+10)+(3x+30)=180
We move all terms to the left:
(2x+10)+(3x+30)-(180)=0
We get rid of parentheses
2x+3x+10+30-180=0
We add all the numbers together, and all the variables
5x-140=0
We move all terms containing x to the left, all other terms to the right
5x=140
x=140/5
x=28
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