The variable is n and n=-5/6
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It is a linear equation in one unknown variable, n. Its solution is n = 1
6n + 5n is 11n.
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
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