In the given circuit, find $i_x(t)$ for $t > 0$. Let $R_1 = R_2 = 1 k\Omega$, $R_3 = 2 k\Omega$, and $C = 0.25 mF$. t=0 $R_2$ $i_x$ 30 mA $R_1$ C $R_3$ The current $i_x(t) = \boxed{} + (\boxed{})(e^{-\boxed{t}}) mA.$
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