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(x+6)+(4x-21)=180
We move all terms to the left:
(x+6)+(4x-21)-(180)=0
We get rid of parentheses
x+4x+6-21-180=0
We add all the numbers together, and all the variables
5x-195=0
We move all terms containing x to the left, all other terms to the right
5x=195
x=195/5
x=39
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