3/x - 4 = x + 4/3
3/x - x = -4/3+4
3 - x2/x = 8/3
3-x = 8/3
x= 3 - 8/3
x=1/3
\(\frac{3}{x-4}=\frac{x+4}{3}\Rightarrow9=\left(x-4\right)\left(x+4\right)\)
\(\Rightarrow\) \(9=x-16hayx-16=9\)
\(\Rightarrow x=9-16\)
\(\Rightarrow x=-5\)
vậy x=-5