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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
-7/q = 11/6 // - 11/6
-7/q-(11/6) = 0
-7/q-11/6 = 0
-7*q^-1 = 11/6 // : -7
q^-1 = -11/42
-1 < 0
1/(q^1) = -11/42 // * q^1
1 = -11/42*q^1 // : -11/42
-42/11 = q^1
q = -42/11
q = -42/11
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