exam Maths Puzzle Numerical Ability

Please help me solve this equation :

5 3
_ = _
2x-3 x+5

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exam Other Question

x^2-1/x divide x+1/x-1

x^2-1/x divide x-1/x+1

=x^2/x ? Stan invested $5,000, part at 8% and part at 17%. If the total interest at the end of the year is $490, how much did he invest at 8%?

thank