2a + 10 + 5a - 2 = (2a + 5a) + (10 - 2) = 7a + 8
No
12a + 6b + 6c = 6(2a + b + c)
5a³ - 4ab + 2a³ = (5+2)a³ - 4ab = 7a³ - 4ab.
2a+5
Add them together: 2a+5a = 7a
-6(a-3b-9c)
2a + 10 + 5a - 2 = (2a + 5a) + (10 - 2) = 7a + 8
2a + 11a - 5a = 8a
-2a plus 3b
2a² + 6a
No
2a + 4b
20a2b2
2a + 3a + 4 = 5a + 4
2a
5a + 11