Question 154702
1/7 - 10/7e + 3/e^2 divided by 1/7 - 1/e
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(1/e) = w
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3w^2 -(10/7)w + (1/7) = 0

21w^2 - 10w + 1 = 0
(3w-1)(7w-1) = 0
w = 1/3 or w = 1/7
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substitute back to "e"
1/e = 1/3 or 1/e = 1/7
e = 3 or e = 7
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Cheers,
Stan H.