Question

In what direction does current flow in a DC circuit?

Answer 1

if there is one dc source then current flow from +ive terminal to -ive terminal.
&
if more than one source than we take out net source (subtract the voltage source if opposite & add if source enhance each other), Than we take the direction of current by above method.

in the diagram the source 1 & 2 have same direction so we add there values & source 3 is oposite so we subtract it from others.
so the net direction is that of current of soure 1&2.