That depends on the value of x and y. As an expression, "x + y" can't be simplified.
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6x - y
2(x+y) is twice the sum of x and y, and 2x+y is the sum of twice x and y
To find the sum of x and y, you simply add the two variables together: sum = x + y. If you have specific values for x and y, you can substitute them into this equation to calculate the sum. Otherwise, the sum remains expressed as x + y.
x+y
(x + y)(x + y)(x + y)