You need to get n alone.
9n=45 → Divide by 9
n=45/9
n=5
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your equation is this 9N=63 9N/9=63/9 N=7 your answer is 7
45+4 = 49 49/7=7 7*7=49-4=45 so x=7
9n + n = 10n
n - 10 + 9n - 3 n + 9n - 10 - 3 10n - 13
n-10+(9n-3)=10n-13