It is simply: 5n+20 which is an algebraic expression because it has no equality sign
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In the equation 5n-11=4n+20, n is equal to 31.
5n+4=0 5n=-4 n= -4/5
5n - 4 = 10n + 6-5n = 10n = -2
6m + 5n - 4m + 7n = 2m + 12n
5n+15 = 25 5n = 25-15 5n = 10 n = 2