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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
2/3 = 6/q-4 // - 6/q-4
2/3-(6/q)+4 = 0
2/3-6*q^-1+4 = 0
-6*q^-1 = -14/3 // : -6
q^-1 = 7/9
-1 < 0
1/(q^1) = 7/9 // * q^1
1 = 7/9*q^1 // : 7/9
9/7 = q^1
q = 9/7
q = 9/7
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