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D( G )
G = 0
G = 0
G = 0
G in (-oo:0) U (0:+oo)
56/G = 7 // - 7
56/G-7 = 0
56*G^-1 = 7 // : 56
G^-1 = 1/8
-1 < 0
1/(G^1) = 1/8 // * G^1
1 = 1/8*G^1 // : 1/8
8 = G^1
G = 8
G = 8
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