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x in (-oo:+oo)
1/3-(4*e^7*x) = 9 // - 9
1/3-(4*e^7*x)-9 = 0
1/3-4*e^7*x-9 = 0
-4*e^7*x-26/3 = 0 // + 26/3
-4*e^7*x = 26/3 // : -4*e^7
x = 26/3/(-4*e^7)
x = -13/6*e^-7
x = -13/6*e^-7
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