Kirchhoff Current Law (KCL) Example Problem

This is similar to problem 2.16 in "Circuit Analysis and Design" by Ulaby, Maharbiz, and Furse. This is a free/open educational textbook on basic circuit design found here: https://cad.eecs.umich.edu/ We will solve for unknowns currents using the KCL. This is an introductory engineering circuits problem.