book Maths Puzzle Numerical Ability

Can you help me solve this equation? -3x+5=2x-10

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book Other Question

If A={x|x is an odd integer} and B={39, 41, 42, 44}, list the elements of A ⋂ B. Suppose you invest $12,000 in two funds paying 10.5% and 13% simple interest. The total annual interest is $1447.50. How much is invested in each fund?