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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
36/30 = 48/g // - 48/g
36/30-(48/g) = 0
36/30-48*g^-1 = 0
-48*g^-1 = -6/5 // : -48
g^-1 = 1/40
-1 < 0
1/(g^1) = 1/40 // * g^1
1 = 1/40*g^1 // : 1/40
40 = g^1
g = 40
g = 40
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