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D( x )
3-(2*e^-4*x) = 0
3-(2*e^-4*x) = 0
3-(2*e^-4*x) = 0
3-2*e^-4*x = 0
3-2*e^-4*x = 0 // - 3
-2*e^-4*x = -3 // : -2*e^-4
x = -3/(-2*e^-4)
x in (-oo:-3/(-2*e^-4)) U (-3/(-2*e^-4):+oo)
y = 12/(3-(2*e^-4*x)) // - 12/(3-(2*e^-4*x))
y-(12/(3-(2*e^-4*x))) = 0
y-12*(3-2*e^-4*x)^-1 = 0
y-12/(3-2*e^-4*x) = 0
(y*(3-2*e^-4*x))/(3-2*e^-4*x)-12/(3-2*e^-4*x) = 0
y*(3-2*e^-4*x)-12 = 0
3*y-2*e^-4*x*y-12 = 0
(3*y-2*e^-4*x*y-12)/(3-2*e^-4*x) = 0
(3*y-2*e^-4*x*y-12)/(3-2*e^-4*x) = 0 // * 3-2*e^-4*x
3*y-2*e^-4*x*y-12 = 0
3*y-2*e^-4*x*y-12 = 0 // - 3*y-12
-2*e^-4*x*y = -(3*y-12) // : -2*e^-4*y
x = (-(3*y-12))/(-2*e^-4*y)
x = (12-(3*y))/(-2*e^-4*y)
x = (12-(3*y))/(-2*e^-4*y)
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