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Follow this example.
f(x) = (x+3)/5
To find its inverse, write y=f(x)
y= (x+3)/5
Interchange x and y
x = (y+3)/5
solve for y in terms of x
5x=y+3
y=5x-3
The inverse of f(x) is f^-1(x) = 5x-3
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