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For some a, b, c in N, let f(x) = ax – 3...

For some `a, b, c in N`, let `f(x) = ax – 3` and `g(x) = x^b + c, x in R`. If `(fog) ^(–1) (x) = ((x-7)/2))^(1/3),` then `(fog) (ac) + (gof) (b)` is equal to _______ .

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