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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
500 = 175000/d // - 175000/d
500-(175000/d) = 0
500-175000*d^-1 = 0
-175000*d^-1 = -500 // : -175000
d^-1 = 1/350
-1 < 0
1/(d^1) = 1/350 // * d^1
1 = 1/350*d^1 // : 1/350
350 = d^1
d = 350
d = 350
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