$$-57+27-30+-60; -57+27-30+-6$$
$-6a-60$
$$-30-30-6a$$
$$-60-6a$$
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$6\left(-a-10\right)$
$$3\left(-20-2a\right)$$
$$-2a-20$$
$$2\left(-a-10\right)$$
$$6\left(-a-10\right)$$