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

How many liters (L) of a 10% silver iodide solution must be mixed with 7 L of a 4% silver iodide solution to get a 6% solution? Solve for the indicated letter.
f=6g
solve for g