exam Maths Puzzle Numerical Ability

Please help me solve: 3x-2 over 4x = 3 over x + 1 over 2

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mixed practice 20- page 689

10a squared + 7a - 12 / (2a + 3) 6.Suppose you invest $1500 in equipment to put pics on T-shirts.You buy each T-shirt for $3..After you have placed the pic on a shirt,you sell it for $20.How many T-shirts must you