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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
17/d+4/d-4+3 = 0
21*d^-1 = 1 // : 21
d^-1 = 1/21
-1 < 0
1/(d^1) = 1/21 // * d^1
1 = 1/21*d^1 // : 1/21
21 = d^1
d = 21
d = 21
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