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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
3/10 = 8/q // - 8/q
3/10-(8/q) = 0
3/10-8*q^-1 = 0
-8*q^-1 = -3/10 // : -8
q^-1 = 3/80
-1 < 0
1/(q^1) = 3/80 // * q^1
1 = 3/80*q^1 // : 3/80
80/3 = q^1
q = 80/3
q = 80/3
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