Need help fixing matlab code they should output same number but it doesnt

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

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

A $=[[135]$;$[2-15]$;$[321]]$;

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

x $=$ A$\backslash$b; $\%$This is matlab's default solver for Ax $=$ b$.$ It's a pretty good.

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

A$\_$inverse $=$ A$^-1$; $\%$Another way to solve Ax $=$ b is to find the inverse of A

$\%$CODE HERE: use A$\_$inverse to find the x that solves Ax $=$ b$.$

x$\_$inverse $=$ A$\_$inverse $*$ b;

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