3a + a = 4a
Example: a = 5
(3x5) + 5 = 15 + 5 = 20 = 4 x 5
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a + 3a - 2 + 3a. Add the a + 3a + 3a = 7a. You can't combine the -2 & 7a so the solution is: 7a - 2.
3a+5b+7a=
3a squared plus nine = 19a. 3a to the second power = 9a plus 9 = 19a.
-7a + 3a = -4a
2a + 5a + 3a = 10a