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D( x )
(-3/4)*x <= 0
(-3/4)*x <= 0
(-3/4)*x <= 0
0-3/4*x <= 0 // - 0
-3/4*x <= 0 // : -3/4
x >= 0/(-3/4)
x >= 0
x in (-oo:0)
-5*ln((-3/4)*x) = -65 // + 65
65-5*ln((-3/4)*x) = 0
65-5*ln((-3/4)*x) = 0 // - 65
-5*ln((-3/4)*x) = -65 // : -5
ln((-3/4)*x) = -65/(-5)
ln((-3/4)*x) = 13
ln((-3/4)*x) = ln(e^13)
(-3/4)*x = e^13
(-3/4)*x-e^13 = 0
-3/4*x-e^13 = 0 // + e^13
-3/4*x = e^13 // : -3/4
x = (e^13)/(-3/4)
x = -4/3*e^13
x = -4/3*e^13
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