7.5 k$\Omega$ $R_4$ + $R_1$ 9.1 k$\Omega$ $E_2$ 3 V $R_3$ 2.2 k$\Omega$ $R_5$ 6.8 k$\Omega$ $E_1$ 18 V $R_2$ 3.3 k$\Omega$ + FIG. 8.122
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