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(7x+13)+(6x+20)=180
We move all terms to the left:
(7x+13)+(6x+20)-(180)=0
We get rid of parentheses
7x+6x+13+20-180=0
We add all the numbers together, and all the variables
13x-147=0
We move all terms containing x to the left, all other terms to the right
13x=147
x=147/13
x=11+4/13
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