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2m + 13n
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An algebraic expression
5n - 4 = 10n + 6-5n = 10n = -2
10n = 7n + 4 + 2n so 10n = 9n + 4 Subtract 9n from both sides: n = 4
6m + 5n - 4m + 7n = 2m + 12n
14M + 2n - 6M + 11n = 8M + 13n