n > -27
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3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (4) = 3n + 6
Just plug in 30 for n in 3n-1. The answer is 89.
3n -5 = 19 3n = 19+5 3n = 24 n = 8
3n + 15 equals 3 times the number n, the answer to which is increased by 15. It can only be evaluated if the value of n is known. The expression can be factorised but that is of marginal help in evaluating it.
5m+2n, n-3m, 7-3n (5m+2n)+(n-3m)+(7-3n)=2m+7