$$7 { x }^{ 3 } { y }^{ 2 } -3 { y }^{ 2 } { x }^{ 3 } +9 { x }^{ 3 } { y }^{ 2 }$$
$13y^{2}x^{3}$
$$4x^{3}y^{2}+9x^{3}y^{2}$$
$$13x^{3}y^{2}$$
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$39\left(xy\right)^{2}$
