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D( x )
10*x <= 0
10*x <= 0
10*x <= 0
10*x+0 <= 0 // - 0
10*x <= 0 // : 10
x <= 0/10
x <= 0
x in (0:+oo)
x*(ln(10*x)/10) = 0
x = 0
ln(10*x)/10 = 0
1/10*ln(10*x) = 0 // : 1/10
ln(10*x) = 0
ln(10*x) = ln(e^0)
10*x = e^0
10*x-e^0 = 0
10*x-1 = 0 // + 1
10*x = 1 // : 10
x = 1/10
x*(ln(10*x)/10) = 0 <=> x = 0 or x*(ln(10*x)/10) = 0 <=> ln(10*x)/10 = 0
x in { 0}
x = 1/10
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