If you mean: 4a +29 -3a -a +3a then it simplifies to 29 +3a
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4a + 3a = (4 + 3)a = 7a
10a − 3 − 4a
-7a + 3a = -4a
14a - 4a + 5a - 3a = 12a
3A or 4A schools are about the size of the students. 4A schools have more students than a 3AM school