SOLUTION: Please explain how the simplifying works to get from: D/3 = 4 + D/9, TO: 3D = 36 + D Also, where could I find more about this type of problem?

Algebra ->  Expressions -> SOLUTION: Please explain how the simplifying works to get from: D/3 = 4 + D/9, TO: 3D = 36 + D Also, where could I find more about this type of problem?      Log On