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D( o )
o = 0
o = 0
o = 0
o in (-oo:0) U (0:+oo)
60/24 = 15/o // - 15/o
60/24-(15/o) = 0
60/24-15*o^-1 = 0
-15*o^-1 = -5/2 // : -15
o^-1 = 1/6
-1 < 0
1/(o^1) = 1/6 // * o^1
1 = 1/6*o^1 // : 1/6
6 = o^1
o = 6
o = 6
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