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(n + 4)(n + 5)
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n - 10 + 9n - 3 = 10n - 13
9n
3n x 3n = 9n if 9n = 36 then n = 36/9 = 4
9n-2=7n+50 7n+9n=50+2 16n=52 n= 3.25