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D( o )
o = 0
o = 0
o = 0
o in (-oo:0) U (0:+oo)
10/9 = 3/o // - 3/o
10/9-(3/o) = 0
10/9-3*o^-1 = 0
-3*o^-1 = -10/9 // : -3
o^-1 = 10/27
-1 < 0
1/(o^1) = 10/27 // * o^1
1 = 10/27*o^1 // : 10/27
27/10 = o^1
o = 27/10
o = 27/10
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