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The function `f(x) = y= -3x + 4` .
Isolate x and express it in terms of y.
`y= -3x + 4`
=> `-3x = y - 4`
=> `x = (4 - y)/3`
=> `f^-1(x) = (4 - x)/3`
The domain and range of `f^-1(x)` is the set of real numbers R.
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