exam Maths Puzzle Numerical Ability

How do you add this rational expression: 3x/8+x/8, whats the answer?

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exam Other Question

Complete the ordered pairs so that each is a solution for the given equation

3x + 4y = 12 (0, ), ( ,3/4 ), ( , 0), (8/3 , )
How to simplify this?
3/(x^3+3x^2-x-3)-2/(x^3-x^2-3x+3)+4/(x^3+x^2-3x-3)