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(x)+(3x+21)+(x-16)=180
We move all terms to the left:
(x)+(3x+21)+(x-16)-(180)=0
We get rid of parentheses
x+3x+x+21-16-180=0
We add all the numbers together, and all the variables
5x-175=0
We move all terms containing x to the left, all other terms to the right
5x=175
x=175/5
x=35
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