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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
3 = 4/g-5 // - 4/g-5
3-(4/g)+5 = 0
3-4*g^-1+5 = 0
-4*g^-1 = -8 // : -4
g^-1 = 2
-1 < 0
1/(g^1) = 2 // * g^1
1 = 2*g^1 // : 2
1/2 = g^1
g = 1/2
g = 1/2
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