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^2+6Y-21=5Y-1
We move all terms to the left:
^2+6Y-21-(5Y-1)=0
We add all the numbers together, and all the variables
6Y-(5Y-1)=0
We get rid of parentheses
6Y-5Y+1=0
We add all the numbers together, and all the variables
Y+1=0
We move all terms containing Y to the left, all other terms to the right
Y=-1
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