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(86+x)2=90
We move all terms to the left:
(86+x)2-(90)=0
We add all the numbers together, and all the variables
(x+86)2-90=0
We multiply parentheses
2x+172-90=0
We add all the numbers together, and all the variables
2x+82=0
We move all terms containing x to the left, all other terms to the right
2x=-82
x=-82/2
x=-41
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