book Maths Puzzle Numerical Ability

I am not sure how to express this question:

ln(Ae^Bx)

I am thinking of simplifying it to

(lnA)-Blnx ?

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book Other Question

Solve for X

6/x^2-1 + 5/x+1 = 3/x-1 i am supposed to find a value of "x", but i am not given the equation, only its derrivative. and when i integrate it, i get a value plus a constant, which i do not know. pls help