Using linearity and the assumption that $V_o = 1 V$, find $V_o$ in the circuit shown given that $V_s = 7 V$, $R_1 = 6 k\Omega$, $R_2 = 2 k\Omega$, $R_3 = 8 k\Omega$, $R_4 = 10 k\Omega$, $R_5 = 6 k\Omega$, $R_6 = 3 k\Omega$,and $R_7 = 8 k\Omega$.

Circuit where $V_o = 1 V$

$I_7=$ $mA$
$V_4=$ $V$
$I_3=$ $mA$
$V_2=$ $V$
$I_1=$ $mA$
$V_s=$ $V$

Original circuit ($V_s = 7 V$)
$V_o=$ $V$