book Maths Puzzle Numerical Ability

I am trying to solve the following equation. y = a -2ab . Solve for 'a'. I am totally lost. Which a do I solve for? I started the equation by subtracting a to each side and get y -

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book Other Question

If a and b are distinct real numbers such that a-b and a^2 -b^2 are rational, must a and b be rational? What is a score?