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x in (-oo:+oo)
2*e^-4-((5/7)*e^-7) = x // - x
2*e^-4-x-((5/7)*e^-7) = 0
2*e^-4-x+(-5/7)*e^-7 = 0
2*e^-4-x-5/7*e^-7 = 0 // - 2*e^-4-5/7*e^-7
-x = -(2*e^-4-5/7*e^-7) // * -1
x = 2*e^-4-5/7*e^-7
x = 2*e^-4-5/7*e^-7
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