book Maths Puzzle Numerical Ability

5/y = -20

Y=

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book Other Question

Write this expression in simplest form.

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

Thanks! simplify 4x-5(x-7) a -x + 35 b) -x-35 c) -x-7 d) 9x+35