book Maths Puzzle Numerical Ability

9-5x = x-15

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how many combinations of 4 different numbers can you make out of the numbers 1 through 50? Solve for x: 7x/x-2 + 2x/x+2 =9 I thought you would use (x-2)(X+2) as your LCD, But I can't seem to come up with an answer after I do that. I keep coming up with 7x+2x=9(x-2)(X+