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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
5/2 = 40/q // - 40/q
5/2-(40/q) = 0
5/2-40*q^-1 = 0
-40*q^-1 = -5/2 // : -40
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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