$$6x- { x }^{ 2 } +4 { x }^{ 2 }$$
$3x\left(x+2\right)$
$$x\left(6-x+4x\right)$$
$$3x+6$$
$$3\left(x+2\right)$$
$$3x\left(x+2\right)$$
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$$6x+3x^{2}$$