# How do you balance NaCN + CuCO_3 -> Na_2CO_3 + Cu(CN)_2?

$2 N a C \equiv N \left(a q\right) + C u C {O}_{3} \left(s\right) \rightarrow N {a}_{2} C {O}_{3} \left(a q\right) + C u {\left(C \equiv N\right)}_{2} \left(a q\right)$
Is the equation above stoichiometrically balanced? Does garbage in equal garbage out? Cyanide treatment of $C {u}^{2 +}$ can lead to reduction, however, given the context of the question, I think the metathesis (partner exchange) reaction is implied.