Assuming the number is n, then the expression is:
5n - 3
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6a-4
It can be: 7x-11
7X-6
An algebraic expression for "6 less than 5 and a number" is (5 - x - 6), where x represents the unknown number.
The algebraic expression for "4 less than the sum of a number and 5" is (n + 5) - 4, where n represents the unknown number.