exam Maths Puzzle Numerical Ability

1/(x-4) - 5/(x+2)=6/(x^2-2x-8)

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Can you please help me solve my problem?

{8*2-(3+9)]+[8-2*3]
I need some assistance on these word problems can anyone help thank you tine!

Use the arithmetic sequence of numbers 2, 4, 6, 8, 10… to find the following:
a) What is d, the d