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1/n + 1/(n+4) = 1/21 =====> n = 3
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Hello!

Could someone please solve by the algebraic approach?

Kind regards!
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1/x + 1/x-4 = 10/21
quadratic equation will be 5x^2 - 41x +42.
Roots of this are x-7 and 5x-6.

since one of the numbers is x=7, the other is 7-4 = 3
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