$$\left. \begin{array} { l } { 5 a + 7 b } \\ { a x - b y } \end{array} \right.$$
$-\left(5a+7b\right)\left(ax-by\right)$
$$-\left(5a+7b\right)\left(ax-by\right)$$
$$-7abx-5xa^{2}+5aby+7yb^{2}$$
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$5a+7b,\ ax-by$
