(UMC) What is the inverse function f: IR - {4 / 3 IR} - {5 / 3} such that:
f (x) = 5x + 7 3x - 4

(UFMG) Let f (x) = x + 3x + 4 and g (x) = ax + b two functions. Determine the constants a and b so that (fog) (x) = (gof) (x) for all x real.

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