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D( x )
x/5 <= 0
x/5 <= 0
x/5 <= 0
1/5*x+0 <= 0 // - 0
1/5*x <= 0 // : 1/5
x <= 0/1/5
x <= 0
x in (0:+oo)
135 = (1/3)*ln(x/5) // - (1/3)*ln(x/5)
135-((1/3)*ln(x/5)) = 0
(-1/3)*ln(x/5)+135 = 0
135-1/3*ln(x/5) = 0 // - 135
-1/3*ln(x/5) = -135 // : -1/3
ln(x/5) = -135/(-1/3)
ln(x/5) = 405
ln(x/5) = ln(e^405)
x/5 = e^405
x/5-e^405 = 0
1/5*x-e^405 = 0 // + e^405
1/5*x = e^405 // : 1/5
x = (e^405)/1/5
x = 5*e^405
x = 5*e^405
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