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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
7/10 = 10/q // - 10/q
7/10-(10/q) = 0
7/10-10*q^-1 = 0
-10*q^-1 = -7/10 // : -10
q^-1 = 7/100
-1 < 0
1/(q^1) = 7/100 // * q^1
1 = 7/100*q^1 // : 7/100
100/7 = q^1
q = 100/7
q = 100/7
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