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x in (-oo:+oo)
e^5*x = 2/3 // - 2/3
e^5*x-(2/3) = 0
e^5*x-2/3 = 0
e^5*x-2/3 = 0 // + 2/3
e^5*x = 2/3 // : e^5
x = 2/3/(e^5)
x = 2/3/(e^5)
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