H-7 or 7
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It is: 5k-7
A number, f, less than 7.
The algebraic expression for "7 less than b" is b - 7. This means you are subtracting 7 from the variable b. In mathematical terms, subtraction is represented by the minus sign (-), so when you see "less than" in a mathematical context, it indicates subtraction.
You would write that as:4 < 7x
x / (2y - 7)