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Consider the expression $3{m}^{2}+\mathit{mn}+3\mathit{mn}+{n}^{2}$.
$\underset{¯}{3{m}^{2}+\mathit{mn}}+\underset{¯}{3\mathit{mn}+{n}^{2}}$
$=m\left(3m+n\right)+n\left(3m+n\right)$
$=\left(3m+n\right)\left(m+n\right)$