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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
44 = 132/d // - 132/d
44-(132/d) = 0
44-132*d^-1 = 0
-132*d^-1 = -44 // : -132
d^-1 = 1/3
-1 < 0
1/(d^1) = 1/3 // * d^1
1 = 1/3*d^1 // : 1/3
3 = d^1
d = 3
d = 3
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