3(4m+n)+2m

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first you distribute 3 to the quantity 4m+n.so now you have 12m + 3n + 2m. now you combine like terms. now its 14m + 3nthats the answer because there is no equal sign.

Use the order of operations.First, distribute the 3 to 4m and n:12m+3n+2mCombine like terms:14m+3n