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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
-105/35 = 21/g // - 21/g
-(21/g)-105/35 = 0
-21*g^-1-105/35 = 0
-21*g^-1 = 3 // : -21
g^-1 = -1/7
-1 < 0
1/(g^1) = -1/7 // * g^1
1 = -1/7*g^1 // : -1/7
-7 = g^1
g = -7
g = -7
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