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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
135/q = 11 // - 11
135/q-11 = 0
135*q^-1 = 11 // : 135
q^-1 = 11/135
-1 < 0
1/(q^1) = 11/135 // * q^1
1 = 11/135*q^1 // : 11/135
135/11 = q^1
q = 135/11
q = 135/11
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