Given f(x)=2x−4f(x) = 2x-4f(x)=2x−4, for what value of xxx is f(x)=xf(x) = xf(x)=x?
x=2x = 2x=2
x=4x = 4x=4
x=0x = 0x=0
x=−4x = -4x=−4