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Explain how you know to use a variable in an addition or subtraction expression.
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Explain how you know to use a variable in an addition or subtraction expression.

User CptRobby
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A variable is just a letter that represents something. So lets say you have 10 pieces of gum and you give your friend X peices of gum. The x stands for the number of peices of gum you gave to your friend.
User Kabaros
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