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x in (-oo:+oo)
160 = ((20*e^1)/2)*x // - ((20*e^1)/2)*x
160-(((20*e^1)/2)*x) = 0
160-10*e*x = 0
160-10*e*x = 0 // - 160
-10*e*x = -160 // : -10*e
x = -160/(-10*e)
x = 16*e^-1
x = 16*e^-1
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