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x in (-oo:+oo)
e^3*x = 7/12 // - 7/12
e^3*x-(7/12) = 0
e^3*x-7/12 = 0
e^3*x-7/12 = 0 // + 7/12
e^3*x = 7/12 // : e^3
x = 7/12/(e^3)
x = 7/12/(e^3)
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