Question
Add: $8ab, -5ab, 3ab, -ab$
✓
Answer
$8ab + (-5ab) + (3ab) + (-ab)$
$= 8ab - 5ab + 3ab - ab$
$= 11ab - 6ab$
$= 5ab$
$= 8ab - 5ab + 3ab - ab$
$= 11ab - 6ab$
$= 5ab$
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