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