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=-2Y^+15Y-7
We move all terms to the left:
-(-2Y^+15Y-7)=0
We get rid of parentheses
2Y^-15Y+7=0
We add all the numbers together, and all the variables
-13Y+7=0
We move all terms containing Y to the left, all other terms to the right
-13Y=-7
Y=-7/-13
Y=7/13
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