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D( x )
ln(2*x) = 0
2*x <= 0
ln(2*x) = 0
ln(2*x) = 0
ln(2*x) = ln(e^0)
2*x = e^0
2*x-e^0 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
2*x <= 0
2*x <= 0
2*x+0 <= 0 // - 0
2*x <= 0 // : 2
x <= 0/2
x <= 0
x in (0:1/2) U (1/2:+oo)
4/ln(2*x) = 0
t_1 = ln(2*x)
4/t_1 = 0
4*t_1^-1 = 0 // : 4
t_1^-1 = 0
t_1 należy do O
x belongs to the empty set
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