The simplest way to represent that amount is (15x - 6).
The "answer" depends on what the number is.
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X = number. 4X + 9 = 2X - 15 ===========
No, however there are even numbers less than 15. An even number is any number that can be divided by two evenly, so it can be greater than 15 too.
3, 6, 9, 12, 15.As in the three times table.
25
It is: 15-5 = 10