If you mean: -3(n+5) = 12 then n works out as -9 because -3(-9+5) = 12
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3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (4) = 3n + 6
12m + 3n - 6m + 7n6m + 10n
8m + 3n - 5m + 10n = 3m +13n
-n + 4n = 4n - n = 3n Done!!!!!
4n-8=3n+2 4n=3n+2+8 4n=3n+10 4n-3n+10 n=10 N = 10