Explanation:
f(x) = 2x - 3
f(m) = 5
that means
5 = 2m - 3
8 = 2m
m = 4
f(-2) = n
n = 2×-2 - 3 = -4 - 3 = -7
so,
m + n = 4 + -7 = -3
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