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(3x+21)=180
We move all terms to the left:
(3x+21)-(180)=0
We get rid of parentheses
3x+21-180=0
We add all the numbers together, and all the variables
3x-159=0
We move all terms containing x to the left, all other terms to the right
3x=159
x=159/3
x=53
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