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(82+86+x)/3=84
We move all terms to the left:
(82+86+x)/3-(84)=0
We add all the numbers together, and all the variables
(x+168)/3-84=0
We multiply all the terms by the denominator
(x+168)-84*3=0
We add all the numbers together, and all the variables
(x+168)-252=0
We get rid of parentheses
x+168-252=0
We add all the numbers together, and all the variables
x-84=0
We move all terms containing x to the left, all other terms to the right
x=84
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