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(7x+30)+(4x+18)=180
We move all terms to the left:
(7x+30)+(4x+18)-(180)=0
We get rid of parentheses
7x+4x+30+18-180=0
We add all the numbers together, and all the variables
11x-132=0
We move all terms containing x to the left, all other terms to the right
11x=132
x=132/11
x=12
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