15 - n when n equals 9 = 6
n = 8
x = 15 - N.
n + 15 = 36 Therefore, n = 36 - 15 n = 21
450/15 = 30
n+15 = 52 n = 52-15 n = 37
15 + n = 24 (subtract 15 from both sides) n = 9
15-3n=n-1
n is 6
14
24
If you know that n = 15, substitute 15 for n and solve: n + 3 - 9 15 + 3 - 9 9