Update HOME_EXAM.md

HOME_EXAM.md

@@ -328,8 +328,7 @@ Declares the variable $`v`$ with type $`t`$ to current scope.
 ### Assign expression
 ```math
 {<v := e, σ> ⇓ σ[v := e]}
-
-\langle \text{test} \rangle
+{\langle \text{test} \rangle}
 ```
 
 ### If true/false expression