book Maths Puzzle Numerical Ability

I need help simplifying this problem:

6-x over x-6 (divison)

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book Other Question

How would you solve y=-1/3+23/3 then graph it? Please show me how to solve: (x/y)^3 / (x/2y)^3

(x/y) is a fraction and (x/2y) is a fraction

Thank you!!!!!!!!!!!