exam Maths Puzzle Numerical Ability

how can i write(a number decreased by the sum of the number and four) as an alg exp and how then do i simplify it?

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exam Other Question

the length of a rectangular playing field is 5ft less than twice its width. If the perimeter of the playing field is 230ft, find the length and width on the field. Solve. 2/5 x – 6 = 12