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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
4/q = 5 // - 5
4/q-5 = 0
4*q^-1 = 5 // : 4
q^-1 = 5/4
-1 < 0
1/(q^1) = 5/4 // * q^1
1 = 5/4*q^1 // : 5/4
4/5 = q^1
q = 4/5
q = 4/5
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