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D( x )
x/73 <= 0
x/73 <= 0
x/73 <= 0
1/73*x+0 <= 0 // - 0
1/73*x <= 0 // : 1/73
x <= 0/1/73
x <= 0
x in (0:+oo)
ln(x/73) = 0
ln(x/73) = ln(e^0)
x/73 = e^0
x/73-e^0 = 0
1/73*x-1 = 0 // + 1
1/73*x = 1 // : 1/73
x = 1/1/73
x = 73
x = 73
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