Find a and b Given Inequality

If 2 < x < 4, then a < 1/(x-6) < b. Find a and b.

2 < x < 4 ---> - 6 < x - 6 < - 2----> -1/6 > 1 / [ x - 6 ] > - 1 / 2

and ' lighthouse ' cannot figure out what a = and b = ???

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