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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
3/q = 5/6 // - 5/6
3/q-(5/6) = 0
3/q-5/6 = 0
3*q^-1 = 5/6 // : 3
q^-1 = 5/18
-1 < 0
1/(q^1) = 5/18 // * q^1
1 = 5/18*q^1 // : 5/18
18/5 = q^1
q = 18/5
q = 18/5
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