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Combine like terms. In that equation,
12a + 26b - 4b - 16a

We will group which are alike.
So, (12a-16a) + (26b-4b)
(-4a) + (22b)

the answer is "-4a+22b".

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Like what he said. And to simplify the expression,
-2(2a-11b). factor the expression..
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