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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
14 = 56/d // - 56/d
14-(56/d) = 0
14-56*d^-1 = 0
-56*d^-1 = -14 // : -56
d^-1 = 1/4
-1 < 0
1/(d^1) = 1/4 // * d^1
1 = 1/4*d^1 // : 1/4
4 = d^1
d = 4
d = 4
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