Subtracting from subqueries

Is there a way for me to do math on 2 subqueries? IE. I have 2 columns that pull data and I want to then have a third column value equal col1-col2. I can run the subqueries all over again, but I think there is a better way.
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Ephraim WangoyaCommented:

select a, b, c-d as e
  (select a, b, (select x from t1) c, (select y from t2) d
   from aa

You can make a subquery of the original, and refer to both columns, e.g.

select col1, col2, (select <subquery1>) sum1, (select <subquery2>) sum2
from sometable

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select col1, col2, sum1, sum2, sum1-sum2 as NewColumn
select col1, col2, (select <subquery1>) sum1, (select <subquery2>) sum2
from sometable
) X

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Make sure to alias the subquery, as required by syntax

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