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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
10/9 = 3/q // - 3/q
10/9-(3/q) = 0
10/9-3*q^-1 = 0
-3*q^-1 = -10/9 // : -3
q^-1 = 10/27
-1 < 0
1/(q^1) = 10/27 // * q^1
1 = 10/27*q^1 // : 10/27
27/10 = q^1
q = 27/10
q = 27/10
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