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(7x-1)+(5x+21)=180
We move all terms to the left:
(7x-1)+(5x+21)-(180)=0
We get rid of parentheses
7x+5x-1+21-180=0
We add all the numbers together, and all the variables
12x-160=0
We move all terms containing x to the left, all other terms to the right
12x=160
x=160/12
x=13+1/3
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