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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = -45/x // + -45/x
24/x-(-45/x) = 0
24/x+45*x^-1 = 0
69*x^-1 = 0 // : 69
x^-1 = 0
x należy do O
x belongs to the empty set
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