Calculate the numerical value for $-\left(4d+2b\right)mn$ when $d=4$, $b=2$ and $m=\frac{1}{2},\:n=\frac{2}{3}$. Replace the unknowns with their corresponding values
Multiply $4$ times $4$
Multiply $2$ times $2$
Add the values $16$ and $4$
Multiply $20$ times $-1$
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