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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
14-7/d = 0
-7*d^-1 = -14 // : -7
d^-1 = 2
-1 < 0
1/(d^1) = 2 // * d^1
1 = 2*d^1 // : 2
1/2 = d^1
d = 1/2
d = 1/2
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