40, m, minus, 3, n, plus, 2, m, minus, 6, plus, 12, m

Evaluate

54m-3n-6

Factor

3\left(18m-n-2\right)

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42m-3n-6+12m

Combine 40m and 2m to get 42m.

54m-3n-6

Combine 42m and 12m to get 54m.

54m-3n-6

Multiply and combine like terms.

3\left(18m-n-2\right)

Factor out 3.