What is the total donation amount made for projects whose main subject area are Literacy & Language?
main subject area refers to primary_focus_area = 'Literacy & Language'; total donation amount refers to Sum(dollar_amount);
SELECT SUM(T2.dollar_amount) FROM projects AS T1 INNER JOIN donations AS T2 ON T1.projectid = T2.projectid WHERE T1.primary_focus_area = 'Literacy & Language'