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(fog)(x) = 3x - 1 / 3x + 1
y = 3x - 1 / 3x + 1
y (3x + 1) = 3x - 1
3xy + y = 3x - 1
3xy - 3x = -y -1
x (3y - 3) = -y -1
x = -y -1 / 3y -3
(fog)^-1(x) = -x -1 / 3x - 3