Finding expresion for current through resistor

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leopard
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Circuit schematic with a current source I_S1 on the left branch, resistors R1 and R4 in parallel vertical branches at the top, resistors R5 and R6 in series along the bottom, and current labels I_4 and I_5.


I want to find an expression for [tex]I_5[/tex].

I see that [tex]I_{S1} = I_4 - I_5[/tex], but how can I proceed from here?
 
What other info were you given for the problem? What are the resistances, etc.?

Just use Kirchoff's voltage and current laws.