$$4-y+2y=6-2y+1$$
$y=1$
$$4+y=6-2y+1$$
$$4+y=7-2y$$
$$4+y+2y=7$$
$$4+3y=7$$
$$3y=7-4$$
$$3y=3$$
$$y=\frac{3}{3}$$
$$y=1$$
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