Evaluate
20-y^{2}-3xy
Differentiate w.r.t. x
-3y
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12+7xy-y^{2}-10xy+8
Combine -3y^{2} and 2y^{2} to get -y^{2}.
12-3xy-y^{2}+8
Combine 7xy and -10xy to get -3xy.
20-3xy-y^{2}
Add 12 and 8 to get 20.
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