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D( G )
G = 0
G = 0
G = 0
G in (-oo:0) U (0:+oo)
10 = 120/G // - 120/G
10-(120/G) = 0
10-120*G^-1 = 0
-120*G^-1 = -10 // : -120
G^-1 = 1/12
-1 < 0
1/(G^1) = 1/12 // * G^1
1 = 1/12*G^1 // : 1/12
12 = G^1
G = 12
G = 12
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