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(5x-15)+(2x+21)=180
We move all terms to the left:
(5x-15)+(2x+21)-(180)=0
We get rid of parentheses
5x+2x-15+21-180=0
We add all the numbers together, and all the variables
7x-174=0
We move all terms containing x to the left, all other terms to the right
7x=174
x=174/7
x=24+6/7
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