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Anonymous
3a - 2b
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3a+5b+7a=
-7a + 3a = -4a
7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2
a + 3a - 2 + 3a. Add the a + 3a + 3a = 7a. You can't combine the -2 & 7a so the solution is: 7a - 2.
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