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D( Q )
Q = 0
Q = 0
Q = 0
Q in (-oo:0) U (0:+oo)
1152/Q = 9 // - 9
1152/Q-9 = 0
1152*Q^-1 = 9 // : 1152
Q^-1 = 1/128
-1 < 0
1/(Q^1) = 1/128 // * Q^1
1 = 1/128*Q^1 // : 1/128
128 = Q^1
Q = 128
Q = 128
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