Problem $7\mathrm{.}62$ Apply nodal analysis to determine $\backslash (\backslash$mathbf$\{$I$\}\_\{\backslash$mathrm$\{$C$\}\}\backslash )$ in the circuit of Fig. P$7\mathrm{.}62.$

Figure P$7\mathrm{.}62$: Circuits for Problems $7\mathrm{.}62$ and $7\mathrm{.}63.$