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D( g )
g = 0
g = 0
g = 0
g in (-oo:0) U (0:+oo)
4/g-9 = 4/g-2 // - 4/g-2
4/g-(4/g)-9+2 = 0
4/g-4*g^-1-9+2 = 0
-7 = 0
g belongs to the empty set
g belongs to the empty set
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