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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
240/45 = 3/g // - 3/g
240/45-(3/g) = 0
240/45-3*g^-1 = 0
-3*g^-1 = -16/3 // : -3
g^-1 = 16/9
-1 < 0
1/(g^1) = 16/9 // * g^1
1 = 16/9*g^1 // : 16/9
9/16 = g^1
g = 9/16
g = 9/16
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