2(x+y)=2x+2y
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Twice the sum of 'x' and 'y' . . . 2(x+y) The sum of twice 'x' and 'y' . . . (2x+y)
If the sum of a number and 4 is (X + 4) then twice that is 2(X + 4) which is 2X + 8
Write the following as an algebraic expression using x as the variable: The sum of a number and -8
3x over x + y
(x + y)/2 ------------