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Anonymous
-7a + 3a = -4a
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3a+5b+7a=
a + 3a - 2 + 3a. Add the a + 3a + 3a = 7a. You can't combine the -2 & 7a so the solution is: 7a - 2.
4a + 3a = (4 + 3)a = 7a
3a - 2b
7a-17 = 4a+1 7a-4a = 1+17 3a = 18 a = 6