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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
(q-(3/(-5)))*((3*q)/q-4) = 0
(q+3/5)*((3*q)/q-4) = 0
-1*(q+3/5) = 0
( -1 )
-1 = 0
q belongs to the empty set
( q+3/5 )
q+3/5 = 0 // - 3/5
q = -3/5
q = -3/5
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