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D( x )
x-(20/200) <= 0
x-(20/200) <= 0
x-(20/200) <= 0
x-1/10 <= 0
x-1/10 <= 0 // + 1/10
x <= 1/10
x in (1/10:+oo)
ln(x-(20/200)) = 2.2 // - 2.2
ln(x-(20/200))-2.2 = 0
ln(x-1/10)-2.2 = 0
ln(x-1/10)-2.2 = 0 // + 2.2
ln(x-1/10) = 2.2
ln(x-1/10) = ln(e^2.2)
x-1/10 = e^2.2
x-e^2.2-1/10 = 0 // + e^2.2+1/10
x = e^2.2+1/10
x = e^2.2+1/10
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