I just tried to solve a very simple system of equations using solve but depending on how I write the system the command does out give any output.
Notice that if I define I__cm then there is no solution being shown. I can rename I__cm to something else like y, still no output. Then in the second system I simply sub I__cm into the equation that has this variable, and it works.
So what's going on here? Why doesn't the first use of solve work?