13 - n = -24
Subtract 13 from each side:
-n = -37
Multiply each side by -1:
n = 37.
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27
n^2 - n = 552 n^2 - n -552 = 0 (n+23)(n-24) = 0 n = 24 n can also be negative 23
24 - n = 5n n = 4
n2 = 5n + 24 (subtract 5n and 24 to both sides)n2 - 5n - 24 = 0(n + 3)(n - 8) = 0n + 3 = 0 or n - 8 = 0n = -3 or n = 8
n + 7 = 4*6 n + 7 = 24 n = 24 - 7 = 17.