Kahn Academy has an excellent algebra section all done with videos. We’d recommend going through from the beginning of their tutorial list as much as possible in the old classroom style. Then again we’ve sifted through them to get to the point, as is the focus of objective based learning. For example in the Fence posts tutorial.
3. http://www.intmath.com/basic-algebra/1-addition-subtraction-algebra.php
2. Do the same thing to both sides
1. https://www.khanacademy.org/math/algebra/introduction-to-algebra