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x in (-oo:+oo)
x/5 = e^405 // - e^405
x/5-e^405 = 0
1/5*x-e^405 = 0 // + e^405
1/5*x = e^405 // : 1/5
x = (e^405)/1/5
x = 5*e^405
x = 5*e^405
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