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Evaluate
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Differentiate w.r.t. x
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-21x-13y-0x+14y
Multiply 0 and 7 to get 0.
-21x-13y-0+14y
Anything times zero gives zero.
-21x-13y+0+14y
Multiply -1 and 0 to get 0.
-21x-13y+14y
Anything plus zero gives itself.
-21x+y
Combine -13y and 14y to get y.