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Well, the phrase they often use is about "apples and Oranges"... If you add them together, you tend to get senseless answers. For example: to add 3 km + 300 meters, it is clear that, since 3 km = 3000 meters, the answers is 3300 meters. If you just go ahead and add 3 + 300, for an answer of 303, well, that doesn't make any sense whatsoever.

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Not normally because as for example 2x+3y = ? can have many solutions but 2x+3x = 5x

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9y ago
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Q: Why can't you combine unlike terms?
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