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