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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
7/22 = 33/d // - 33/d
7/22-(33/d) = 0
7/22-33*d^-1 = 0
-33*d^-1 = -7/22 // : -33
d^-1 = 7/726
-1 < 0
1/(d^1) = 7/726 // * d^1
1 = 7/726*d^1 // : 7/726
726/7 = d^1
d = 726/7
d = 726/7
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