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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
2/3 = 3/q // - 3/q
2/3-(3/q) = 0
2/3-3*q^-1 = 0
-3*q^-1 = -2/3 // : -3
q^-1 = 2/9
-1 < 0
1/(q^1) = 2/9 // * q^1
1 = 2/9*q^1 // : 2/9
9/2 = q^1
q = 9/2
q = 9/2
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