> I made it an easy equation to make a point It was a bad example then. Obviously there are equations that are difficult to solve by hand and you don't need to

> I made it an easy equation to make a point It was a bad example then. Obviously there are equations that are difficult to solve by hand and you don't need to remember all tricks in order to do successful modeling, but if you're not able to solve x+1=7, it means you don't even understand what an equation is, so you won't be able to use it for modeling anything.