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Evaluate
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Differentiate w.r.t. x
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7x^{2}+2y^{2}-7-12y^{2}+15
Combine -3x^{2} and 10x^{2} to get 7x^{2}.
7x^{2}-10y^{2}-7+15
Combine 2y^{2} and -12y^{2} to get -10y^{2}.
7x^{2}-10y^{2}+8
Add -7 and 15 to get 8.