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$7\mathrm{.}4$ Linearity and Its Consequences

$45.$ With regard to the circuit represented in $\backslash (\backslash$sqrt$\{\backslash$Delta$\}\backslash )$ Fig. $7\mathrm{.}66,($a$)$ write a complete set of nodal equations and $($b$)$ write a complete set of mesh equations.