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D( q )
q-1 = 0
q-4 = 0
q-1 = 0
q-1 = 0
q-1 = 0 // + 1
q = 1
q-4 = 0
q-4 = 0
q-4 = 0 // + 4
q = 4
q in (-oo:1) U (1:4) U (4:+oo)
4/(q-4) = 10/(q-1) // - 10/(q-1)
4/(q-4)-(10/(q-1)) = 0
4/(q-4)-10*(q-1)^-1 = 0
4/(q-4)-10/(q-1) = 0
(4*(q-1))/((q-4)*(q-1))+(-10*(q-4))/((q-4)*(q-1)) = 0
4*(q-1)-10*(q-4) = 0
36-6*q = 0
(36-6*q)/((q-4)*(q-1)) = 0
(36-6*q)/((q-4)*(q-1)) = 0 // * (q-4)*(q-1)
36-6*q = 0
36-6*q = 0 // - 36
-6*q = -36 // : -6
q = -36/(-6)
q = 6
q = 6
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