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x in (-oo:+oo)
((4*e^1)/2)*x = 4 // - 4
((4*e^1)/2)*x-4 = 0
((4*e)/2)*x-4 = 0
2*e*x-4 = 0 // + 4
2*e*x = 4 // : 2*e
x = 4/(2*e)
x = 2*e^-1
x = 2*e^-1
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