exam Maths Puzzle Numerical Ability

solve: 1/x - 1/x+3 = 1/6

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exam Other Question

Can you please explain how to do this problem. the abosolute value of x-2 is less than or equal to 9. The answer is x is less than or equal to 11 or x is greater than or equal to -7. How do you get these? Solve for z in the following problem:

9z+12=9(z+3)