exam Maths Puzzle Numerical Ability

Can someone help me on the following problems. I would greatly appreciate it.
Thank you

x+3/x+6=x-5/x+2

x/x-1+5/x+1=3x/x^2-1

7/x-4+1/x+4=-5x/x^2-16

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exam Other Question

I know the sale price of something and the percentage, I want to find the original price......can you help? I do not understand this?

Express 50(ten) in binary, trinary and base 4.

thankyou Danielle