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21a + 9b
----------------- +
34a + b
2. 42n + 35m + 7
-20n - 50m + 9
----------------------- -
62n + 85m - 2
3. (x - y) - (6x + 4) = -5x - y - 4
4. (5x^2 - 9xy - 4y^2) - (-x^2 - 6xy + 3y^2) = 6x^2 - 3xy - 7y^2