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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
5 = 10/g // - 10/g
5-(10/g) = 0
5-10*g^-1 = 0
-10*g^-1 = -5 // : -10
g^-1 = 1/2
-1 < 0
1/(g^1) = 1/2 // * g^1
1 = 1/2*g^1 // : 1/2
2 = g^1
g = 2
g = 2
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