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If the function f : R rarr R be defined ...

If the function `f : R rarr R` be defined as `f(x) = (3x + 4)/(5x-7), (x ne 7//5)` and
`g : R rarr R` be defined as `g(x) = ( 7x + 4)/(5x - 3),(x ne 3//5)`
show that `(g o f)(x) = (f o g)(x)`.

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