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(7x+13)+(5x+23)=180
We move all terms to the left:
(7x+13)+(5x+23)-(180)=0
We get rid of parentheses
7x+5x+13+23-180=0
We add all the numbers together, and all the variables
12x-144=0
We move all terms containing x to the left, all other terms to the right
12x=144
x=144/12
x=12
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