exam Maths Puzzle Numerical Ability

(5/x+6)-(3/x-6)

The denominators are the same but how do you change their signs so you can subtract?

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exam Other Question

How would you solve the following equation?

3x-5(3x-7) = 2(x+9)+45

Thank you for your help find the area of the circle if its radius is 3.5cm