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(72+x)/2=85
We move all terms to the left:
(72+x)/2-(85)=0
We add all the numbers together, and all the variables
(x+72)/2-85=0
We multiply all the terms by the denominator
(x+72)-85*2=0
We add all the numbers together, and all the variables
(x+72)-170=0
We get rid of parentheses
x+72-170=0
We add all the numbers together, and all the variables
x-98=0
We move all terms containing x to the left, all other terms to the right
x=98
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