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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
5/q = 12/20 // - 12/20
5/q-(12/20) = 0
5/q-3/5 = 0
5*q^-1 = 3/5 // : 5
q^-1 = 3/25
-1 < 0
1/(q^1) = 3/25 // * q^1
1 = 3/25*q^1 // : 3/25
25/3 = q^1
q = 25/3
q = 25/3
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