The sum of a number and 9 is -2.
a.
n - 9 = -2; 7
c.
-n + 9 = -2; 11
b.
n + 9 = -2; -11
d.
n + 9 = 2; -7

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sum means addition.

n+9= -2
n +9-9 = -2-9
therefore n = -11

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