book Maths Puzzle Numerical Ability

Hi I am stumped on this one: x-2/4x=1/6
the directions say to solve and check.
Thank you

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book Other Question

An investment is made at 8% compounded annually. It grows to $702 at the end of 1 year. How much was originally invested? ** whenever n is used with V, T - it is a subscript**

Question

Let V be a finite dimensional inner product space. A
sequence Vn of vectors in V is said to converge to a
vec