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D( o )
o = 0
o = 0
o = 0
o in (-oo:0) U (0:+oo)
2-(3/o)-1 = 0
2-3*o^-1-1 = 0
-3*o^-1 = -1 // : -3
o^-1 = 1/3
-1 < 0
1/(o^1) = 1/3 // * o^1
1 = 1/3*o^1 // : 1/3
3 = o^1
o = 3
o = 3
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