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D( x )
5-x <= 0
5-x <= 0
5-x <= 0
5-x <= 0
-x <= -5 // * -1
x >= 5
x in (-oo:5)
0 = ln(5-x)/3 // - ln(5-x)/3
0-(ln(5-x)/3) = 0
-(ln(5-x)/3) = 0
-1/3*ln(5-x) = 0 // : -1/3
ln(5-x) = 0
ln(5-x) = ln(e^0)
5-x = e^0
5-x-e^0 = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x = 4
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