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g(x) = (x - 2)/(1 + x)
y = (x - 2)/(1 + x)
Vamos a hacer
x = f(y)
y(1 + x) = x - 2
y + yx = x - 2
yx - x = - 2 - y
x(y - 1) = - 2 - y
x = (- 2 - y)/(y - 1)
y^-1 = (- 2 - x)/(x - 1)
[g^-1(x)] = - (2 + x)/(x - 1) RESULTADO FINAL
TU RESULTADO ES CORRECTO