$$- 5 a + ( - 3 a ) + ( - 7 a ) ( + 5 a )$$
$-a\left(35a+8\right)$
$$-5a-3a-7a^{2}\times 5$$
$$-8a-7a^{2}\times 5$$
$$-8a-35a^{2}$$
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$$a\left(-8-35a\right)$$
$$-35a-8$$
$$a\left(-35a-8\right)$$
