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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
6/g = 7/15 // - 7/15
6/g-(7/15) = 0
6/g-7/15 = 0
6*g^-1 = 7/15 // : 6
g^-1 = 7/90
-1 < 0
1/(g^1) = 7/90 // * g^1
1 = 7/90*g^1 // : 7/90
90/7 = g^1
g = 90/7
g = 90/7
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