exam Maths Puzzle Numerical Ability

Can you help me solve this equation please?

1. 9/x = 4/3x + 1

x = ?

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exam Other Question

If x = 10, the number 3,425 could be expressed as 3x^3 + 4x^2 + 2x + 5 and the number 215 could be expressed as 2x^2 + x + 5. If I divide 3,425 by 215 it will be equivalent to div how do you divide the numerator.