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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
3/5 = 405/q // - 405/q
3/5-(405/q) = 0
3/5-405*q^-1 = 0
-405*q^-1 = -3/5 // : -405
q^-1 = 1/675
-1 < 0
1/(q^1) = 1/675 // * q^1
1 = 1/675*q^1 // : 1/675
675 = q^1
q = 675
q = 675
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