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