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(x-21)+(2x-15)=180
We move all terms to the left:
(x-21)+(2x-15)-(180)=0
We get rid of parentheses
x+2x-21-15-180=0
We add all the numbers together, and all the variables
3x-216=0
We move all terms containing x to the left, all other terms to the right
3x=216
x=216/3
x=72
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