$$-xy-8xy-19xy+40 \times y$$
$40y-28xy$
$$\left(-x\right)y-27xy+40y$$
$$-28xy+40y$$
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$4y\left(10-7x\right)$
$$y\left(-x-8x-19x+40\right)$$
$$-28x+40$$
$$4\left(-7x+10\right)$$
$$4y\left(-7x+10\right)$$
