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x in (-oo:+oo)
e^-4*x = 2/3 // - 2/3
e^-4*x-(2/3) = 0
e^-4*x-2/3 = 0
e^-4*x-2/3 = 0 // + 2/3
e^-4*x = 2/3 // : e^-4
x = 2/3/(e^-4)
x = 2/3/(e^-4)
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