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(9)^2-8y=121.5
We move all terms to the left:
(9)^2-8y-(121.5)=0
We add all the numbers together, and all the variables
-8y-40.5=0
We move all terms containing y to the left, all other terms to the right
-8y=40.5
y=40.5/-8
y=-5+0.5/8
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