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(7x-13)+(2x+4)=180
We move all terms to the left:
(7x-13)+(2x+4)-(180)=0
We get rid of parentheses
7x+2x-13+4-180=0
We add all the numbers together, and all the variables
9x-189=0
We move all terms containing x to the left, all other terms to the right
9x=189
x=189/9
x=21
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