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2v+3w=60 0.5v+4w=40 i need help solving it

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Unable to come up with the correct solution. (2y/x^2)+(7/x(x-3)). The solution I came up with was 2y+7/x^2(x-3) Three people decided to do some weight lifting with papers. Paper Stack 001 weighed 1 hg, Stack 2 weighed .01 kg, and Stack 3 weighed 100g. They exercised 1/2 hour.

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