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x in (-oo:+oo)
((e^7)/10)*x = 4 // - 4
((e^7)/10)*x-4 = 0
((e^7)/10)*x-4 = 0 // + 4
((e^7)/10)*x = 4 // : (e^7)/10
x = 4/((e^7)/10)
x = 40*e^-7
x = 40*e^-7
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