Evaluate
3x^{2}-8y+4
Differentiate w.r.t. x
6x
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3x^{2}-7y+6-y-2
Combine 8x^{2} and -5x^{2} to get 3x^{2}.
3x^{2}-8y+6-2
Combine -7y and -y to get -8y.
3x^{2}-8y+4
Subtract 2 from 6 to get 4.
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