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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
15/g = 12/8 // - 12/8
15/g-(12/8) = 0
15/g-3/2 = 0
15*g^-1 = 3/2 // : 15
g^-1 = 1/10
-1 < 0
1/(g^1) = 1/10 // * g^1
1 = 1/10*g^1 // : 1/10
10 = g^1
g = 10
g = 10
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