Equivalent function for DATEADD() in Oracle

Question

I have to get a date that is 6 months from the system date in Oracle.
And I have to get it by running an open-query from SQL. DATEADD(MONTH,-6, GETDATE())

Answer 1

--ORACLE SQL EXAMPLE
SELECT
SYSDATE
,TO_DATE(SUBSTR(LAST_DAY(ADD_MONTHS(SYSDATE, -1)),1,10),'YYYY-MM-DD')
FROM DUAL