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Lucas Steffen · Answer 1 · 2016-08-13T06:41:52+0000

6a + 3b - 4a - 5b

Gather the a's and b's together: 6a - 4a + 3b - 5b

Add up the a's : 2a + 3b - 5b

Add up the b's : 2a + -2b

There you are: 2a - 2b

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