$$4x-5+6x2+4-2x2-x+x2-7x$$
$-4x+5x_{2}-1$
$$4x-1+6x_{2}-2x_{2}-x+x_{2}-7x$$
$$4x-1+4x_{2}-x+x_{2}-7x$$
$$3x-1+4x_{2}+x_{2}-7x$$
$$3x-1+5x_{2}-7x$$
$$-4x-1+5x_{2}$$
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$-4$