Question: Addition and subtraction, Simplify. a. 9a + 3a + 7a b. 6m - 2m - m c. -4a 8 + 3a - 2 d.
a. 9a + 3a + 7a
b. 6m - 2m - m
c. -4a – 8 + 3a - 2
d. 2a – 15 - 5a + 1
e. 2x - 3y - 4x - y
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