$$(2x+z)and; (4x-z)$$
$2\left(2x-1\right)\left(x+1\right)$
$$2x+2=2\left(x+1\right)$$ $$4x-2=2\left(2x-1\right)$$
$$2\left(2x-1\right)\left(x+1\right)$$
$$4x^{2}+2x-2$$
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$2x+2,\ 4x-2$