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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
8/9 = 12/q // - 12/q
8/9-(12/q) = 0
8/9-12*q^-1 = 0
-12*q^-1 = -8/9 // : -12
q^-1 = 2/27
-1 < 0
1/(q^1) = 2/27 // * q^1
1 = 2/27*q^1 // : 2/27
27/2 = q^1
q = 27/2
q = 27/2
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