A + 2a = 3a
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n + 2n = 3n
twice a number means a number times 2
composite number
Yes, the word twice is an adverb. e.g. I played the game twice. (number of times)
Suppose you start with x. Twice x is 2x. Three less than that is 2x-3 So 2x-3 = x Add 3 to both sides: 2x = x + 3 Subtract 1x from both sides: x = 3. You started with 3.