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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
3/q = 5/10 // - 5/10
3/q-(5/10) = 0
3/q-1/2 = 0
3*q^-1 = 1/2 // : 3
q^-1 = 1/6
-1 < 0
1/(q^1) = 1/6 // * q^1
1 = 1/6*q^1 // : 1/6
6 = q^1
q = 6
q = 6
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