It's impressive that these expressions are able to stay so rational even when they're having operations performed on them.

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Numbers and Operations: Elementary Number Theory 
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Simplifying Rational Expressions 
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Multiplying Rational Expressions 
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Word Problems with Addition and Subtraction 
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Addition and Subtraction of Double Digit Numbers with Carrying 
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Addition and Subtraction of One Digit Numbers 
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Adding and Subtracting Rational Expressions 
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Solving TwoStep Equations using Addition and Subtraction