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Here is an expression with four terms:

3 cows + 4 chickens + 6 cows - 2 chickens

The two 'cow' terms can be combined: 3 cows + 6 cows = 9 cows

The two 'chicken' terms can be combined: 4 chickens - 2 chickens = 2 chickens

So after combining like terms, the expression is: 9 cows + 2 chickens .

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Q: What does it mean to put together like-terms in an expression or equation?
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