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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
9 = 45/g // - 45/g
9-(45/g) = 0
9-45*g^-1 = 0
-45*g^-1 = -9 // : -45
g^-1 = 1/5
-1 < 0
1/(g^1) = 1/5 // * g^1
1 = 1/5*g^1 // : 1/5
5 = g^1
g = 5
g = 5
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