2k + 1
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3 + 2K ≤ 15Subtract 3 from each side:2K ≤ 12Divide each side by 2 :K ≤ 6
K is two times m add 1 k = (2 m ) + 1 k=2m+1
2k - 7
3 - k
As an algebraic expression it is: k-3