Need help fixing the following matlab code I keep getting different values they should be the same

$\%$ #$1$ Solving Ax $=$ b

$\%$ There are several ways to solve Ax $=$ b in MATLAB. Consider the following:

A $=[135$; $215$; $321]$; $\%$ Use square brackets for a column vector

b $=[1$; $6$; $9]$;

x $=$ A$\backslash$b; $\%$ MATLAB's default solver for Ax $=$ b

disp$([\text{'}$The maximum difference between Ax and b is: $\text{'},$ num$2$str$($max$($abs$($A$*$x$-$b$)))])$;

A$\_$inverse $=$ inv$($A$)$; $\%$ Finding the inverse of A

x$\_$inverse $=$ A$\_$inverse $*$ b; $\%$ Solve Ax $=$ b using the inverse of A

disp$([\text{'}$The maximum difference using the inverse is: $\text{'},$ num$2$str$($max$($abs$($A$*$x$\_$inverse $-$ b$)))])$;