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Well, darling, a 2-step equation that equals 21 could be something like 2x + 5 = 21. First, you'd subtract 5 from both sides to get 2x = 16, then divide by 2 to find x = 8. Voila, you've got yourself a sassy solution!
-16
n + 13 = 21. n = 21 - 13
It is an equation and the value of x is 7
21