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