Let g(n) = y
We then have y = -n + 3.
Exchange y and n.
n = -y + 3
Solve for y.
n - 3 = -y
(n - 3)/(-1) = -y/(-1)
-(n - 3) = y
Replace y with g^(-1) n.
-(n - 3) = g^(-1) n
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