7.1 round 2

word problems...

https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-super-yoga/e/equations-in-one-variable-1

variables on both sides... 

https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-solving-equations/cc-8th-linear-equations/e/linear_equations_3