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What is 13x - 7y + 4x?
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What is 13x - 7y + 4x?

User Marco Bonelli
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17X-7Y. You add or subtract the same variables, in this case you only have two x's and one y. So you add them, because you have a addition sign. 13x+4x and you leave the Y alone, because there is not another Y variable.
User Vanina
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