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D( q )
q-1 = 0
q-2 = 0
q-1 = 0
q-1 = 0
q-1 = 0 // + 1
q = 1
q-2 = 0
q-2 = 0
q-2 = 0 // + 2
q = 2
q in (-oo:1) U (1:2) U (2:+oo)
2/(q-1) = 3/(q-2) // - 3/(q-2)
2/(q-1)-(3/(q-2)) = 0
2/(q-1)-3*(q-2)^-1 = 0
2/(q-1)-3/(q-2) = 0
(2*(q-2))/((q-1)*(q-2))+(-3*(q-1))/((q-1)*(q-2)) = 0
2*(q-2)-3*(q-1) = 0
-q-1 = 0
(-q-1)/((q-1)*(q-2)) = 0
(-q-1)/((q-1)*(q-2)) = 0 // * (q-1)*(q-2)
-q-1 = 0
-q-1 = 0 // + 1
-q = 1 // * -1
q = -1
q = -1
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