7n + 1 = 6n + 8
7n=6n+7 (minus 1 from each side) n=7 (7n-6n equals n, you are left with n=7)
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This question as written can be taken two ways: 9m + 6n - 3m + 7n = 6m + 13n, or (9m + 6n) - (3m + 7n) = 9m + 6n - 3m - 7n = 6m - n
It is a linear equation in one unknown variable, n. Its solution is n = 1
7n3 + 6n = n*(7n2 + 6)
n = 1 7n + 6n - 5 = 4n + 4 13n - 5 = 4n + 4 13n - 4n - 5 = 4n - 4n + 4 9n - 5 = 4 9n -5 + 5 = 4 + 5 9n = 9 n = 1
10n + 3 = 7n + 53n = 2n = 2/3