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(y-4)2=13
We move all terms to the left:
(y-4)2-(13)=0
We multiply parentheses
2y-8-13=0
We add all the numbers together, and all the variables
2y-21=0
We move all terms containing y to the left, all other terms to the right
2y=21
y=21/2
y=10+1/2
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