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4n - 5n is biger and no it not
5n+6n-2n can be solved by combining like terms. Combine 5n and 6n and -2n to get 9n.
7n -1n,0n,1n,2n,3n,4n,5n,6n,7n 1 2 3 4 5 6 7 8 9
9n + 18 = 81 9n = 63 n = 7
9n/7 I think. I had the same question.