Find $I_1$ using single node-pair analysis (do not reduce the circuit).

$Is_{1}=1A,\, Is_{2}=2A,\, Is_{3}=3A,\, R_1=2 \Omega,\, R_2=4\Omega$ and $R_3=4\Omega$ .

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Solution
a) Redraw the circuit if necessary. Mark the voltage across nodes:
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