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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
6/15 = 14/q // - 14/q
6/15-(14/q) = 0
6/15-14*q^-1 = 0
-14*q^-1 = -2/5 // : -14
q^-1 = 1/35
-1 < 0
1/(q^1) = 1/35 // * q^1
1 = 1/35*q^1 // : 1/35
35 = q^1
q = 35
q = 35
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