You are trying to find the value of n.
So divide 9 from both sides and you will get the value of n since the 9's will cancel out on the left side of the equation.
This will leave you with
n = 14
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Not sure if you mean 7x 6y as in 7*6y=126, where * means "multiplied by" and you must solve for y or if you mean that we must solve for both x and y, but the answer to the part where you are solving 7*6y=126 is 3.
it equals -4n
9n-2=7n+50 7n+9n=50+2 16n=52 n= 3.25
8m + (4n - 6m) + 9n =8m + 4n - 6m + 9n =(8m - 6m) + (4n + 9n) =2m + 13n
126/63 which is 2.