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(4x+80)+(3x+51)=180
We move all terms to the left:
(4x+80)+(3x+51)-(180)=0
We get rid of parentheses
4x+3x+80+51-180=0
We add all the numbers together, and all the variables
7x-49=0
We move all terms containing x to the left, all other terms to the right
7x=49
x=49/7
x=7
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