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.
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15-3n=n-1
3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (4) = 3n + 6
4n-8=3n+2 4n=3n+2+8 4n=3n+10 4n-3n+10 n=10 N = 10
3n + 2n = 7 + 4n 5n = 7 + 4n 5n - 4n = 7 n = 7
n=1/3 or 0.333333333333333 repeated.