7 y - 2 x + 5,21 y - 6 x + 15
Evaluate
\frac{1221y}{100}-8x+15
Differentiate w.r.t. x
-8
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12,21y-2x-6x+15
Combine 7y and 5,21y to get 12,21y.
12,21y-8x+15
Combine -2x and -6x to get -8x.
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