f(x) = 5-x - 3
y = 5-x - 3
x = 5-y - 3
x+3 = 5-y
log5(x+3) = -y
y = -log5(x+3)
f-1(x) = -log5(x+3)
f(x) = 5-x - 3
y = 5-x - 3
x = 5-y - 3
x+3 = 5-y
log5(x+3) = -y
y = -log5(x+3)
f-1(x) = -log5(x+3)
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