exam Maths Puzzle Numerical Ability

Please help solve the following homework problem:

4/x-5=6/8x+2

I get -9/13, but am not sure if that is the answer.

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exam Other Question

Could I please get help with the following problem:

Find a general formula for the arithmetic sequence whose 8th term is -20 and the 17th term is -47

Thank You 15-g=23-2g