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tube + 4.
The sum of four times a number and twice the same number can be represented mathematically as (4x + 2x), where (x) is the number. Combining the terms, this simplifies to (6x). Therefore, the result is six times the number.
2(x+y) is twice the sum of x and y, and 2x+y is the sum of twice x and y
4
This is an algebraic expression. It can be written as 3(2x + 4)