3A + 9B = 3(A + 3B)
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3a * * * * * Actually, it is 4a.
2a + 3a + 4 = 5a + 4
a + 3a - 2 + 3a. Add the a + 3a + 3a = 7a. You can't combine the -2 & 7a so the solution is: 7a - 2.
2a + 4b
5a + 4b - 3a =(5a - 3a) + 4b =2a + 4b =2 (a + 2b)