exam Maths Puzzle Numerical Ability

hello, i need some help to simplify and reduce to lowest terms

1/(x+5y)-5/(x-5y)+3/(x^2-25y^2)

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exam Other Question

Can someone help me on this?
I need to find the LCM for 4 and 20. (Least common multiples)

Thanks,
Ashley
What is the relationship between y=4x+24 and 2y=8x+12? Are they perpendicular, parallel, or neither? Please answer as soon as possible. Thank you!!