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