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(2x+90)2+x=555
We move all terms to the left:
(2x+90)2+x-(555)=0
We add all the numbers together, and all the variables
x+(2x+90)2-555=0
We multiply parentheses
x+4x+180-555=0
We add all the numbers together, and all the variables
5x-375=0
We move all terms containing x to the left, all other terms to the right
5x=375
x=375/5
x=75
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