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20+3x+2(x+15)=180
We move all terms to the left:
20+3x+2(x+15)-(180)=0
We add all the numbers together, and all the variables
3x+2(x+15)-160=0
We multiply parentheses
3x+2x+30-160=0
We add all the numbers together, and all the variables
5x-130=0
We move all terms containing x to the left, all other terms to the right
5x=130
x=130/5
x=26
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