exam Maths Puzzle Numerical Ability

Can you give me a hand with this one? Thanks!

x/x-2 = 2/x-3 Solve for x

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exam Other Question
page 301 #18 If x2 - 13x + 42 = (x + A)(x + B), then A + B =

-42
-1
13
42
none of these

thank you