book Maths Puzzle Numerical Ability

Please help me solove for Y:

4/(x-2)+3/xy = 4/5x

Thank you!

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book Other Question

Eight people want to play a 48 minute game as a team but only a team of exactly five is allowed to play. However, during the game, a player may be replaced by someone else. Suppose if 2x+1 is a multiple of 5,and if 2x+1<100, how many possible values of x are prime numbers