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D( x )
2*ln(7)-ln(3) = 0
2*ln(7)-ln(3) = 0
2*ln(7)-ln(3) = 0
2*ln(7)-ln(3) = 0
x belongs to the empty set
x in (-oo:+oo)
(2*ln(3)-ln(7))/(2*ln(7)-ln(3)) = x // - x
(2*ln(3)-ln(7))/(2*ln(7)-ln(3))-x = 0
(2*ln(3)-ln(7))/(2*ln(7)-ln(3))-x = 0 // - (2*ln(3)-ln(7))/(2*ln(7)-ln(3))
-x = -((2*ln(3)-ln(7))/(2*ln(7)-ln(3))) // * -1
x = (2*ln(3)-ln(7))/(2*ln(7)-ln(3))
x = (2*ln(3)-ln(7))/(2*ln(7)-ln(3))
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