exam Maths Puzzle Numerical Ability

I am not sure how to do this problem. Thanks for your help!
Problem:
[((x+1 / x-1)+1) / ((x+1 / x-1)-1)]^5
What I have come up with:
[((x + 1/x -1)+1)*((x-1/x+1)-1)]^5

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exam Other Question

2% milk contains 2% Butterfat. Whipped cream contains 9% Butterfat.How much whipped cream and 2% milk should be mixed to obtain 35 gallons of milk with 4% butterfat? Please help!!!

(4x+4)/5 = (5x-1)/2 - x/3 You must show all work to receive full credit.

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