Evaluate
13x-6y+9w
Differentiate w.r.t. x
13
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5x-6y+14w-5w+8x
Combine -2y and -4y to get -6y.
5x-6y+9w+8x
Combine 14w and -5w to get 9w.
13x-6y+9w
Combine 5x and 8x to get 13x.
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