book Maths Puzzle Numerical Ability

let f(x) = 1/x+1 + 3/x-5
find all values of "a" for which : f(a) = f(a+6)

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book Other Question

Can you please explain to me how you create an equation (function) from looking at a parabola? I can make a parabola from an equation. But not the other way around. I need very easy and explained steps!
Thanks for your time and effort.
-C. A. (A/G, 1.25%, 57) is not tabulated.
Find the value of A/G using the appropriate formula, not by interpolation.

B. What is the present worth of the following cash flows?