Tolong di jawab no 6

f(x) = x-2/x+4
y = x-2/x+4
y (x+4) = x-2
xy + 4y =x-2
xy-x = (-2) - 4y
x (y-1) = (-2) - 4y
x = (-2) - 4y / y-1
f ^-1 (x) = (-2) - 4x / x-1 = 4x+2/1-x