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D( X )
X/300 <= 0
X/300 <= 0
X/300 <= 0
1/300*X+0 <= 0 // - 0
1/300*X <= 0 // : 1/300
X <= 0/1/300
X <= 0
X in (0:+oo)
12 = 27*ln(X/300) // - 27*ln(X/300)
12-(27*ln(X/300)) = 0
12-27*ln(X/300) = 0
12-27*ln(X/300) = 0 // - 12
-27*ln(X/300) = -12 // : -27
ln(X/300) = -12/(-27)
ln(X/300) = 4/9
ln(X/300) = ln(e^(4/9))
X/300 = e^(4/9)
X/300-e^(4/9) = 0
1/300*X-e^(4/9) = 0 // + e^(4/9)
1/300*X = e^(4/9) // : 1/300
X = (e^(4/9))/1/300
X = 300*e^(4/9)
X = 300*e^(4/9)
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