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D( x )
7*ln(x) = 0
x <= 0
7*ln(x) = 0
7*ln(x) = 0
7*ln(x) = 0 // : 7
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
x <= 0
x in (0:1) U (1:+oo)
((7*ln(x))^-1)/3 = 0
t_1 = ln(x)
((7*t_1)^-1)/3 = 0
1/21*t_1^-1 = 0 // : 1/21
t_1^-1 = 0
t_1 należy do O
x belongs to the empty set
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