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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*(550/x) = 6*(550/x) // - 6*(550/x)
5*(550/x)-(6*(550/x)) = 0
5*(550/x)-3300*x^-1 = 0
-550*x^-1 = 0 // : -550
x^-1 = 0
x należy do O
x belongs to the empty set
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