Let $I_1$ be the current in the loop containing the 12 mA source and the 4 k$\Omega$ resistor. Let $I_2$ be the current in the loop containing the 3 k$\Omega$, 6 k$\Omega$, and 12 V source. Let $I_3$ be the current in the loop containing the 12 V source and the 2
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