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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
2.5/35 = 2/d // - 2/d
2.5/35-(2/d) = 0
2.5/35-2*d^-1 = 0
-2*d^-1 = -0.07142857 // : -2
d^-1 = 0.03571429
-1 < 0
1/(d^1) = 0.03571429 // * d^1
1 = 0.03571429*d^1 // : 0.03571429
27.99999664 = d^1
d = 27.99999664
d = 27.99999664
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