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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
56 = 16/q // - 16/q
56-(16/q) = 0
56-16*q^-1 = 0
-16*q^-1 = -56 // : -16
q^-1 = 7/2
-1 < 0
1/(q^1) = 7/2 // * q^1
1 = 7/2*q^1 // : 7/2
2/7 = q^1
q = 2/7
q = 2/7
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