Find the inverse function of f informally. Verify that f (f-1 (x)) = x and f-1(f (x))

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Find the inverse function of f informally. Verify that f (f-1 (x)) = x and f-1(f (x)) = x.
1. f(x) = 6x
2. f(x) = 1/3x
3. f(x) = 3x + 1
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