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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
3/q = 10/9 // - 10/9
3/q-(10/9) = 0
3/q-10/9 = 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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