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(6x+13)+(7x-5)=180
We move all terms to the left:
(6x+13)+(7x-5)-(180)=0
We get rid of parentheses
6x+7x+13-5-180=0
We add all the numbers together, and all the variables
13x-172=0
We move all terms containing x to the left, all other terms to the right
13x=172
x=172/13
x=13+3/13
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