Leaving in algebraic form means you aren't finding a solution, but can see that, e.g. with '3x = 2y/12z' increasing z will decrease x, but increasing y will inc

Leaving in algebraic form means you aren't finding a solution, but can see that, e.g. with '3x = 2y/12z' increasing z will decrease x, but increasing y will increase x. So you know the trends for the variables, and which ones can be usefully manipulated. Reasonable advice, if a little glib.