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D( x )
x/y <= 0
x/y <= 0
x/y <= 0
x/y = 0
x*y^-1 = 0 // : y^-1
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
x in (0:+oo)
ln(x/y)-ln(10) = 0
ln(x/y)-ln(10) = 0 // + ln(10)
ln(x/y) = ln(10)
x/y = 10
x/y-10 = 0
x*y^-1-10 = 0 // + 10
x*y^-1 = 10 // : y^-1
x = 10/(y^-1)
x = 10/(y^-1)
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