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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
189/g = -21 // + 21
189/g+21 = 0
189*g^-1 = -21 // : 189
g^-1 = -1/9
-1 < 0
1/(g^1) = -1/9 // * g^1
1 = -1/9*g^1 // : -1/9
-9 = g^1
g = -9
g = -9
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