Question
Add : $13ab − 9cd − xy, 5xy, 15cd − 7ab, 6xy − 3cd$
✓
Answer
$13ab − 9cd + xy$
$+ 5xy$
$−7ab + 15cd$
$− 3cd + 6xy$
$6ab + 3cd +10xy$
$+ 5xy$
$−7ab + 15cd$
$− 3cd + 6xy$
$6ab + 3cd +10xy$
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