Help!!!!

In the junction shown below, the current values are as follows; wire 1 = 7.5A, wire 2 = 12.0A, wire 3 = 5.5A, and wire 4 = 3.0A. What is the value and direction (- = out, + = in) of the current in wire 5? Wire 2 Wire 3 Wire 4 Wire 1 Wire 5