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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
10/q = 9/5 // - 9/5
10/q-(9/5) = 0
10/q-9/5 = 0
10*q^-1 = 9/5 // : 10
q^-1 = 9/50
-1 < 0
1/(q^1) = 9/50 // * q^1
1 = 9/50*q^1 // : 9/50
50/9 = q^1
q = 50/9
q = 50/9
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