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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
6.3/4.9 = 18/g // - 18/g
6.3/4.9-(18/g) = 0
6.3/4.9-18*g^-1 = 0
-18*g^-1 = -1.28571429 // : -18
g^-1 = 0.07142857
-1 < 0
1/(g^1) = 0.07142857 // * g^1
1 = 0.07142857*g^1 // : 0.07142857
14.00000028 = g^1
g = 14.00000028
g = 14.00000028
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