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Mathematics 11 Online
OpenStudy (pixiedust1):

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OpenStudy (anonymous):

Just add the numbers for like letters. 10x and 5x have the same variable (x) so you can add the numbers to get 15x. 7y is the only value with variable y, so it's already simplified as much as it can be. So 10x+5x+7y simplifies to 15x+7y.

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