exam Maths Puzzle Numerical Ability

(2x+5)(5x-3)

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The problem is 2/x^-4. I know the way to solve normal negative exponents so I tried that and got: 2/1/x^4, simplified to 2/x^4 because 2/1 is 2. I got 2/x^4 as a final answer. Is this correct? Find three consecutive even integers for which 3 times the largest is twice the sum of the two smallest integers.