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D( x )
e^2*x <= 0
e^2*x <= 0
e^2*x <= 0
e^2*x+0 <= 0 // - 0
e^2*x <= 0 // : e^2
x <= 0/(e^2)
x <= 0
x in (0:+oo)
ln(e^2*x) = ln(8/7) // - ln(8/7)
ln(e^2*x)-ln(8/7) = 0
ln(e^2*x)-ln(8/7) = 0 // + ln(8/7)
ln(e^2*x) = ln(8/7)
e^2*x = 8/7
e^2*x-8/7 = 0 // + 8/7
e^2*x = 8/7 // : e^2
x = 8/7/(e^2)
x = 8/7/(e^2)
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