There is some ambiguity in the statement, which really requires parentheses to indicate which operation should be done first. So, four less than (y times 6) is written as 6y - 4, but (four less than y) times 6 is written as 6(y - 4). These quantities are quite different. For example, suppose that y = 5. Then, 6y - 4 works out to be 30 - 4 = 26. In comparison, 6(y - 4) = 6(5 - 4) = 6(1) = 6.
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6a-4
3x-4
7r-6
They are two terms of an algebraic expression.
It can be: 7x-11