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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = 4/7 // - 4/7
ln(x)-(4/7) = 0
ln(x)-4/7 = 0
ln(x)-4/7 = 0 // + 4/7
ln(x) = 4/7
ln(x) = ln(e^(4/7))
x = e^(4/7)
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