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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
6/7 = 54/d // - 54/d
6/7-(54/d) = 0
6/7-54*d^-1 = 0
-54*d^-1 = -6/7 // : -54
d^-1 = 1/63
-1 < 0
1/(d^1) = 1/63 // * d^1
1 = 1/63*d^1 // : 1/63
63 = d^1
d = 63
d = 63
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