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(x+90+82+81)/4=86
We move all terms to the left:
(x+90+82+81)/4-(86)=0
We add all the numbers together, and all the variables
(x+253)/4-86=0
We multiply all the terms by the denominator
(x+253)-86*4=0
We add all the numbers together, and all the variables
(x+253)-344=0
We get rid of parentheses
x+253-344=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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