Adding two column data from two different tables.

Hi, I have two tables i want to add two column with same id and put it in third table
T1 is
id Value
1 50
2 100
3 500
4 75
T2 is
id Value
3 -20
4 80
5 -30
6 -10
I want the out put as
1 50
2 100
3 480
4 155
5 -30
6 -10
i have written
select a.id,a.value+b.value from t1 a,t2 b where a.id=b.id(+)
this is not giving me the id's from t2.

select id, sum(value) from
(Select id,value from t1
union
select id ,value from t2
)group by id;

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