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x in (-oo:+oo)
300 = ((200*e^3)/10)*x // - ((200*e^3)/10)*x
300-(((200*e^3)/10)*x) = 0
300-20*e^3*x = 0
300-20*e^3*x = 0 // - 300
-20*e^3*x = -300 // : -20*e^3
x = -300/(-20*e^3)
x = 15*e^-3
x = 15*e^-3
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