\"\"

\

The expression is \"\".

\

\"\"                        (Apply commutative property of addition: \"\")

\

\"\"                        (Apply distributive property: \"\")

\

\"\"                                 (Add: \"\")\"\"

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The terms are 2m,n,6m.

\

The like terms are 2m,6m.

\

The coefficients are \"\".