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y = x/x-3
xy-3y = x
xy-x = 3y
x(y-1) = 3y
x = 3y/y-1
f^-1 (x) = 3x/x-1
f^-1 (-2) = 3(-2)/-2-1
= -6/-3
= 2
nah kalau mau invers jadinya f(x)^-1 = 3x/x-1
nah f(x)^-1 (-2) = 3(-2)/-2-1
= -6/-3
= 2
hehe cmiiw yak :)