book Maths Puzzle Numerical Ability

-200=k+(-99)

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okay, i have one simple question because i left my math book at home :X
3 / x+1 - 3/x-1

I know you must first change the subtract to add, and make the 3 negativ
each edge of the cube is 3cm.What is the volume of the cube?(the possibilites are....6cm., 9cm., 27cm., or none of these)