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x in (-oo:+oo)
e^3*x = 5/7 // - 5/7
e^3*x-(5/7) = 0
e^3*x-5/7 = 0
e^3*x-5/7 = 0 // + 5/7
e^3*x = 5/7 // : e^3
x = 5/7/(e^3)
x = 5/7/(e^3)
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