Question
Add : $8x − 3y + 7z, −4x + 5y − 4z, −x − y − 2z$
✓
Answer
$8x − 3y + 7z$
$−4x + 5y − 4z$
$−x − y − 2z$
$3x + y + z$
$−4x + 5y − 4z$
$−x − y − 2z$
$3x + y + z$
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