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(86+93+x)/3=90
We move all terms to the left:
(86+93+x)/3-(90)=0
We add all the numbers together, and all the variables
(x+179)/3-90=0
We multiply all the terms by the denominator
(x+179)-90*3=0
We add all the numbers together, and all the variables
(x+179)-270=0
We get rid of parentheses
x+179-270=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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