Sometimes, we just want fewer y's...or more x's. That's why it's great to know how to add and subtract variables. In real life, though, we try to avoid racking up more "exes." It's just a policy.

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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 
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Single Digit Addition with Carrying 
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Shmoop? What is that? 
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Jane Eyre Summary