exam Maths Puzzle Numerical Ability

Can someone please help me factor x(2x-y) + y(2x-y) Thanks!

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exam Other Question

1. find the total number of selection of five letters for the letters of the word SUCCESS.
2. how many different arrangements of three balls in a row can be made from one red two Please can you help me with this problem?

sqrt 30x-15 = x+7