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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
8/g = 20 // - 20
8/g-20 = 0
8*g^-1 = 20 // : 8
g^-1 = 5/2
-1 < 0
1/(g^1) = 5/2 // * g^1
1 = 5/2*g^1 // : 5/2
2/5 = g^1
g = 2/5
g = 2/5
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