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(100 – 2Px + 1Py) (Px -20)

Now, take the derivative of the above with respect to Px to get the following first order condition :
100- 4 Px + Py +40 = 0

When i try to multiply and then take the derivative of the top part out I keep getting : -1860-4Px-19Py

What am I doing wrong??

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