book Maths Puzzle Numerical Ability

How do you solve this equation? 3/4(8n-4)=-2. i tried but i got the wrong answer

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mr. tell invested half of his money at 5%, one-third of his money at 4%, and the rest of his money at 3.5%. if his total annual investment income was $530.00, how much had he inves how do I make y a product of x?