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(91+x)/2=91
We move all terms to the left:
(91+x)/2-(91)=0
We add all the numbers together, and all the variables
(x+91)/2-91=0
We multiply all the terms by the denominator
(x+91)-91*2=0
We add all the numbers together, and all the variables
(x+91)-182=0
We get rid of parentheses
x+91-182=0
We add all the numbers together, and all the variables
x-91=0
We move all terms containing x to the left, all other terms to the right
x=91
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