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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
-744/q = 24 // - 24
-744/q-24 = 0
-744*q^-1 = 24 // : -744
q^-1 = -1/31
-1 < 0
1/(q^1) = -1/31 // * q^1
1 = -1/31*q^1 // : -1/31
-31 = q^1
q = -31
q = -31
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