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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
18/d+13 = 6/d-13 // - 6/d-13
18/d-(6/d)+13+13 = 0
18/d-6*d^-1+13+13 = 0
12*d^-1 = -26 // : 12
d^-1 = -13/6
-1 < 0
1/(d^1) = -13/6 // * d^1
1 = -13/6*d^1 // : -13/6
-6/13 = d^1
d = -6/13
d = -6/13
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