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D( x )
s-t = 0
s^2-t^2 = 0
s-t = 0
s-t = 0
s-t = 0
x należy do R
s^2-t^2 = 0
s^2-t^2 = 0
s^2-t^2 = 0
x należy do R
x belongs to the empty set
(2*s)/(s^2-t^2)-(s/(s-t)) = 0
x belongs to the empty set
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