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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
4/g = -12 // + 12
4/g+12 = 0
4*g^-1 = -12 // : 4
g^-1 = -3
-1 < 0
1/(g^1) = -3 // * g^1
1 = -3*g^1 // : -3
-1/3 = g^1
g = -1/3
g = -1/3
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