book Maths Puzzle Numerical Ability

x+5/7=8/9 i have tried subtracting to get my answer. it is very comfusing. i have also tried adding. i don't know if what i get is write or wrong.(the / stands for a fraction)

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book Other Question

Where do you put the parentheses to make to following equation =15?

14+5-10/2*7-2-3=15 How many pounds of chocolates costing $4.60 per pound may be mixed with 6 lb of chocolates costing $5 per pound to produce a mixture that can be sold for $4.90 per pound?