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x in (-oo:+oo)
e^3*x-5 = 9/4 // - 9/4
e^3*x-(9/4)-5 = 0
e^3*x-9/4-5 = 0
e^3*x-29/4 = 0 // + 29/4
e^3*x = 29/4 // : e^3
x = 29/4/(e^3)
x = 29/4/(e^3)
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