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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
3/14 = 15/g // - 15/g
3/14-(15/g) = 0
3/14-15*g^-1 = 0
-15*g^-1 = -3/14 // : -15
g^-1 = 1/70
-1 < 0
1/(g^1) = 1/70 // * g^1
1 = 1/70*g^1 // : 1/70
70 = g^1
g = 70
g = 70
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