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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
7.6/4 = 1.9/d // - 1.9/d
7.6/4-(1.9/d) = 0
7.6/4-1.9*d^-1 = 0
-1.9*d^-1 = -1.9 // : -1.9
d^-1 = 1
-1 < 0
1/(d^1) = 1 // * d^1
1 = 1*d^1 // : 1
1 = d^1
d = 1
d = 1
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