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D( x )
((2*x)/3)*y <= 0
((2*x)/3)*y <= 0
((2*x)/3)*y <= 0
((2*x)/3)*y = 0
2/3*x*y = 0 // : 2/3*y
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
x in (0:+oo)
4*ln(((2*x)/3)*y) = 0
4*ln(((2*x)/3)*y) = 0 // : 4
ln(((2*x)/3)*y) = 0
ln(((2*x)/3)*y) = ln(e^0)
((2*x)/3)*y = e^0
((2*x)/3)*y-e^0 = 0
2/3*x*y-1 = 0 // + 1
2/3*x*y = 1 // : 2/3*y
x = 1/(2/3*y)
x = 3/2*y^-1
x = 3/2*y^-1
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