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D( x )
x/6 <= 0
x/6 <= 0
x/6 <= 0
1/6*x+0 <= 0 // - 0
1/6*x <= 0 // : 1/6
x <= 0/1/6
x <= 0
x in (0:+oo)
x*ln(x/6) = 0
x = 0
ln(x/6) = 0
ln(x/6) = ln(e^0)
x/6 = e^0
x/6-e^0 = 0
1/6*x-1 = 0 // + 1
1/6*x = 1 // : 1/6
x = 1/1/6
x = 6
x*ln(x/6) = 0 <=> x = 0 or x*ln(x/6) = 0 <=> ln(x/6) = 0
x in { 0}
x = 6
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