book Maths Puzzle Numerical Ability

x-1/(x-5) = 4/(x-5)

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book Other Question

I'm not sure how to get the square root of 81c^5d^4
Could you help me? thanks!
Write this expression in simplest form.

4r^2 - 25s^2/2r^2 + 3rs - 20s^2

Thanks!