If by simplify you mean factorize, we have to factorize: g^2 - 20gh - g + 20h

g^2 - 20gh - g + 20h

factorize the the common factor (g - 20h)

=> g(g - 20h) - 1(g - 20h)

=> (g - 1)(g - 20h)

**The factorized form is g^2 - 20gh - g + 20h = (g - 1)(g - 20h).**

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