7 less than 9 is two. It is always two, unless you are asking some sort of trick question. This is an arithmetic question, not an algebra one. The problem 9 - 7 = 2 is true across all branches of mathematics, and though it might be encountered in just about any place, it has its basis in arithmetic.
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3x - 7 ≤ 9 "Seven less than" means that you subtract seven from the answer. "Three times a number" means that you multiply it. "At most" means that this is the greatest number that it can be, which is, in this case, 9. To solve this, you apply the principle rules of algebra to determine x. 3x ≤ 9 + 7 3x ≤ 16 x ≤ 16/3
When you subtract 9 from 7, you get -2. This is because you are moving 9 units in the negative direction from the starting point of 7 on the number line. In mathematical terms, 7 - 9 = -2.
9
9 is one less than 10.
If you want to say "Nine is less than a number k," you would write 9<K. If you're asking for an equation, e.g. "Nine less than a number k is equal to that number divided by three," you would write k - 9.