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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
(5/1)/4 = 20/q // - 20/q
(5/1)/4-(20/q) = 0
5/4-20*q^-1 = 0
-20*q^-1 = -5/4 // : -20
q^-1 = 1/16
-1 < 0
1/(q^1) = 1/16 // * q^1
1 = 1/16*q^1 // : 1/16
16 = q^1
q = 16
q = 16
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