3*(2m + 1) is equivalent.
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When m is 7, (6m + 3) is (42 + 3) = 45.(45)3 = 91,125
6m + 5n - 4m + 7n = 2m + 12n
14M + 2n - 6M + 11n = 8M + 13n
2m + 13n
6m + m + m + 4y + n + y + 12 + 2n Group like terms: 6m + m + m + 2n + n + 4y + y + 12 Add: 8m + 3n + 5y + 12