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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
10/q = 8/62 // - 8/62
10/q-(8/62) = 0
10/q-4/31 = 0
10*q^-1 = 4/31 // : 10
q^-1 = 2/155
-1 < 0
1/(q^1) = 2/155 // * q^1
1 = 2/155*q^1 // : 2/155
155/2 = q^1
q = 155/2
q = 155/2
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