book Maths Puzzle Numerical Ability

here is another one I have no clue about..
3/x+5=3/3x-2
If you could show how you did it I just might be able to understand it
Thanks

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book Other Question

Vern invested $11,000. Part was invested at 15% and part at 13%. If the total interest at the end of the year is $1,610, how much did he invest at 15%? I am having trouble with a problem, I think I found the answer but, I am not sure. My question is Solve the subtraction problem 8/9 - 3/4? I think the answer is 5/36? Am I right, Please let me know.