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You cannot write an algebraic expression for that, you need an equation. The equation is n - 6 = 4
The algebraic expression for "4 less than the sum of a number and 5" is (n + 5) - 4, where n represents the unknown number.
n + 4
the + of a number and 10 k decreased by 4 = k-4
Watch this closely:[ X+4 ].