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(fog)^(-1)(x)
(fog)^(-1)(x) = (f (g(x)))^(-1)
(fog)^(-1)(x) = (f (2x+1))^(-1)
(fog)^(-1)(x) = ((2x+1) - 11)^(-1)
(fog)^(-1)(x) = (2x + 1 - 11)^(-1)
(fog)^(-1)(x) = (2x - 10)^(-1)
(fog)^(-1)(x) = (x+10) / 2