12a + a - 3a = 10a
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14a - 4a + 5a - 3a = 12a
The GCF is 3a
2/3a / 4 = 2/3a / 4/1 = 2/3a x 1/4 = 2/12a = 1/6a
a + 3a - 2 + 3a. Add the a + 3a + 3a = 7a. You can't combine the -2 & 7a so the solution is: 7a - 2.
since a=1a, 3a-1a=2a