x-7 - Tom had some cards. He gave 7 away., 7-x - Sam had 7 popsicles. He ate some., n+10 - Our class has some points. We just earned 10 more., 32/c - I have 32 flowers. I want to put them equally into vases. , 4t - Pat wants to give 4 stickers to each of her friends., b+12 - My aunt has some toys. I give her 12 more., a number, a variable, and an operation - an expression, a letter that represents an unknown amount - a variable,

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