exam Maths Puzzle Numerical Ability

university of phoenix elementary and intermediate algebra perfom indicated operation or solve equation x2 -4 divided by 4x - 8
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I need your help with a problem please.

6/y-1 + 9/y

Could you please show me step by step how to solve this?
Thank you Not sure if I did this right...

√-3 - √-75

I came up with √3i - 5√3i

Thanks!