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(86+95+84+97+x)/5=90
We move all terms to the left:
(86+95+84+97+x)/5-(90)=0
We add all the numbers together, and all the variables
(x+362)/5-90=0
We multiply all the terms by the denominator
(x+362)-90*5=0
We add all the numbers together, and all the variables
(x+362)-450=0
We get rid of parentheses
x+362-450=0
We add all the numbers together, and all the variables
x-88=0
We move all terms containing x to the left, all other terms to the right
x=88
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