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Question
Subtract:
4x − 6y + 3z from 12x + 7y − 21z.
Sum
Solution
(12x + 7y − 21z) − (4x − 6y + 3z)
= 12x + 7y − 21z − 4x + 6y − 3z
= 12x − 4x + 7y + 6y − 21z − 3z
= 8x + 13y − 24z
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