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(5x-25)+(2x+21)=180
We move all terms to the left:
(5x-25)+(2x+21)-(180)=0
We get rid of parentheses
5x+2x-25+21-180=0
We add all the numbers together, and all the variables
7x-184=0
We move all terms containing x to the left, all other terms to the right
7x=184
x=184/7
x=26+2/7
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