exam Maths Puzzle Numerical Ability

I need your help solving this problem:3x+y-1=49

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An amimal requires 743 g of protein and 24g of calcium daily. How many pounds of protein would be required? How many pounds of calcium would be required? Please help solve 14 + (-1). The answer I got was 13. I just want to make sure that my answer is correct. I am a little rusty on this problem. Thank you for your help.