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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
5/g = 7/2 // - 7/2
5/g-(7/2) = 0
5/g-7/2 = 0
5*g^-1 = 7/2 // : 5
g^-1 = 7/10
-1 < 0
1/(g^1) = 7/10 // * g^1
1 = 7/10*g^1 // : 7/10
10/7 = g^1
g = 10/7
g = 10/7
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