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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
3 = -84/g // + -84/g
3-(-84/g) = 0
84*g^-1+3 = 0
84*g^-1 = -3 // : 84
g^-1 = -1/28
-1 < 0
1/(g^1) = -1/28 // * g^1
1 = -1/28*g^1 // : -1/28
-28 = g^1
g = -28
g = -28
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