Find a formula for the inverse, that is find LaTeX: \displaystyle f^{-1}(x) if LaTeX: \displaystyle f(x)=\frac{8 - 7 x}{7 x - 6} .

LaTeX: \displaystyle f^{-1}(x)=\frac{2 \left(3 x + 4\right)}{7 \left(x + 1\right)}