basic+Algebra

I am going to teach you basic algebra for example: 7+Y=15 5+X=12 X+Y=? To figure it out look at the following:

As you see to figure out what Y equals you subtract **7** from **15** which equals **8**. Then to figure out what X equals you subtract **5** from **12** which equals **7**. Then to figure out what Y+X equals you add **8** and **7** which is **15**.

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