exam Maths Puzzle Numerical Ability

Can you please help me in simplifying this complex fraction?

x-3/x+3 + x+3/x-3
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x-3/x+3 - x+3/x-3

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exam Other Question

I am stuck on correct answer for:

3 over 2 - 5 over 6 =

I believe answer is 2 over 3 but I need to verify my work. Can you show me the breakdown to get correct resolve? x<-2