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10n = 7n + 4 + 2n so 10n = 9n + 4 Subtract 9n from both sides: n = 4
An algebraic expression
10n = 80.n = 8.
If: 10n = 1,000,000 Then: n = 100,000
5n - 4 = 10n + 6-5n = 10n = -2