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(3x+20)+(x+5)=180
We move all terms to the left:
(3x+20)+(x+5)-(180)=0
We get rid of parentheses
3x+x+20+5-180=0
We add all the numbers together, and all the variables
4x-155=0
We move all terms containing x to the left, all other terms to the right
4x=155
x=155/4
x=38+3/4
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