exam Maths Puzzle Numerical Ability

((7/x-1)+(6/x+2))/((9/x+1)-(8-x-1))

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exam Other Question

Show that 0.00315 (line of the 15) is a rational number by writing it as a fraction of integers. can you please help me solve this: (r^-6s^-2)/[(r^2s^6)^-1]
Thank you so much!!