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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
180/d = 10 // - 10
180/d-10 = 0
180*d^-1 = 10 // : 180
d^-1 = 1/18
-1 < 0
1/(d^1) = 1/18 // * d^1
1 = 1/18*d^1 // : 1/18
18 = d^1
d = 18
d = 18
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