book Maths Puzzle Numerical Ability

Solve for X

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

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book Other Question

BOB AND MARY TOGETHER SELL 22 APPLES
BOB AND DON SELL 14 APPLES
DON AND MARY SELL 16 APPLES
HOW MANY DID EACH SELL? THANK YOU
I am not sure how to express this question:

ln(Ae^Bx)

I am thinking of simplifying it to

(lnA)-Blnx ?