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

3X+2Y=5
-2X+3Y=27
(x-4)
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(x/4)-(4/x)

that line makes it a fraction. please simplify this complex fraction. thanks.