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D( x )
(3-1)/x = 0
x = 0
(3-1)/x = 0
(3-1)/x = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/((3-1)/x) = 4 // - 4
3/((3-1)/x)-4 = 0
3/2*x-4 = 0 // + 4
3/2*x = 4 // : 3/2
x = 4/3/2
x = 8/3
x = 8/3
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