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The batteries shown in the circuit in figure 19.57 have negligibly small internal resistances. Find the current through (a) the 30 ohm resister, (b)...

The batteries shown in the circuit in figure 19.57 have negligibly small internal resistances.  Find the current through (a) the 30 ohm resister, (b)  the 20 ohm resister and (c) the 10 volt battery.  
The picture is attached.  It's #57
I need a clear mapped out way to solve this problem.

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