book Maths Puzzle Numerical Ability

Can you please help to answer the following question:
.
Find all pairs of positive integers x and y that satisfy the equation:
1/x - 1/y = 1/2005

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book Other Question

I can't figure this out. I'm thinking I have to write two equations, but I don't know what they need to be. please help!

Abigail has a credit card from Arctic Bank and anoth evaluate the expression

5+x+(-3)for x=-2