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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
(6^0)/q-4 = 0
1/q-4 = 0
1*q^-1 = 4 // : 1
q^-1 = 4
-1 < 0
1/(q^1) = 4 // * q^1
1 = 4*q^1 // : 4
1/4 = q^1
q = 1/4
q = 1/4
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