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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
4/q = 8 // - 8
4/q-8 = 0
4*q^-1 = 8 // : 4
q^-1 = 2
-1 < 0
1/(q^1) = 2 // * q^1
1 = 2*q^1 // : 2
1/2 = q^1
q = 1/2
q = 1/2
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