$$-(y+13)-(13,5-y+4)$$
$-30,5$
$$-y-13-\left(13,5-y+4\right)$$
$$-y-13-\left(17,5-y\right)$$
$$-y-13-17,5-\left(-y\right)$$
$$-y-13-17,5+y$$
$$-y-30,5+y$$
$$-30,5$$
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