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x in (-oo:+oo)
(1/3)*e^2*x = 7 // - 7
(1/3)*e^2*x-7 = 0
1/3*e^2*x-7 = 0 // + 7
1/3*e^2*x = 7 // : 1/3*e^2
x = 7/(1/3*e^2)
x = 21*e^-2
x = 21*e^-2
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