7n3 + 6n = n*(7n2 + 6)
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6n + 5n is 11n.
I assume that you mean n = 3 6n + 4 = 6(3) + 4 = 18 + 4 = 22
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
7n + 1 = 6n + 8 7n=6n+7 (minus 1 from each side) n=7 (7n-6n equals n, you are left with n=7)
6n