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D( o )
o = 0
o = 0
o = 0
o in (-oo:0) U (0:+oo)
4/5 = 40/o // - 40/o
4/5-(40/o) = 0
4/5-40*o^-1 = 0
-40*o^-1 = -4/5 // : -40
o^-1 = 1/50
-1 < 0
1/(o^1) = 1/50 // * o^1
1 = 1/50*o^1 // : 1/50
50 = o^1
o = 50
o = 50
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