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(3x+21)+(6x-60)=180
We move all terms to the left:
(3x+21)+(6x-60)-(180)=0
We get rid of parentheses
3x+6x+21-60-180=0
We add all the numbers together, and all the variables
9x-219=0
We move all terms containing x to the left, all other terms to the right
9x=219
x=219/9
x=24+1/3
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