In Oracle SQL query below why i am getting output like this ? Please tell me the logic behind

Question

Table 1 Employee table

Table 2 Dept table

I wanted to filter employees who are working in LOC dallas and chicago

I know the correct query should be like below , we should use brackets (LOC = 'DALLAS' OR LOC = 'CHICAGO')

SELECT * 
FROM EMP E, DEPT D 
WHERE E.DEPTNO  =  D.DEPTNO 
AND (LOC = 'DALLAS' OR LOC = 'CHICAGO')

Here 11 rows were coming in output

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But , i just wanted to see what would happen if we don't put brackets like below

SELECT * 
FROM EMP E, DEPT D 
WHERE E.DEPTNO  =  D.DEPTNO 
AND LOC = 'DALLAS' OR LOC = 'CHICAGO'

Here 19 rows were coming in output

I want to understand basically how this query is getting executed.