exam Maths Puzzle Numerical Ability

why is the answer to this promblem 2x-2/x+1
problem- 4x4_ / 2x3
x2-1/x2-2x+1

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I had a question on a test which was the absolute value (using l in lieu of the absolute value sign) of l3-5xl=-7. The answer is 0. Is this because x cannot be negative? Hello I need some one to help with this solution please. Last year ralph had $5 million in operation income. there was net depreciation of $1 million and interest expense of $1mill