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(120+x)/3=161
We move all terms to the left:
(120+x)/3-(161)=0
We add all the numbers together, and all the variables
(x+120)/3-161=0
We multiply all the terms by the denominator
(x+120)-161*3=0
We add all the numbers together, and all the variables
(x+120)-483=0
We get rid of parentheses
x+120-483=0
We add all the numbers together, and all the variables
x-363=0
We move all terms containing x to the left, all other terms to the right
x=363
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