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We can factor an a from ax and ay so we have a times x plus y. We can also
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factor a 2 from 2x and 2y. So we'll have plus 2 times x plus y. And notice if we
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were to just distribute we'd get back with what we started with. But in this
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line there's something incredible happening. This would be one term made up of
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two factors a times x plus y. This would be another term made up of two factors,
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2 and x plus y. So do you see it? What's the common factor for each of these
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terms? Write your answer here.