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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = 42/5 // - 42/5
ln(x)-(42/5) = 0
ln(x)-42/5 = 0
ln(x)-42/5 = 0 // + 42/5
ln(x) = 42/5
ln(x) = ln(e^(42/5))
x = e^(42/5)
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