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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
26/39 = 22/q // - 22/q
26/39-(22/q) = 0
26/39-22*q^-1 = 0
-22*q^-1 = -2/3 // : -22
q^-1 = 1/33
-1 < 0
1/(q^1) = 1/33 // * q^1
1 = 1/33*q^1 // : 1/33
33 = q^1
q = 33
q = 33
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