$$(9ab-ab+8ab+5ab)-15ab+2ab-12ab)$$
$-4ab$
$$8ab+8ab+5ab-15ab+2ab-12ab$$
$$16ab+5ab-15ab+2ab-12ab$$
$$21ab-15ab+2ab-12ab$$
$$6ab+2ab-12ab$$
$$8ab-12ab$$
$$-4ab$$
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$-4b$