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Add : 2a + 6b + 8c, 16a + 13c + 18b...

Add :
2a + 6b + 8c, 16a + 13c + 18b

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(2a + 6b + 8c) + (16a + 13c + 18b)
= 2a + 6b + 8c + 16a + 13c + 18b
2a + 16a + 6b + 18b + 8c + 13c
= 18a + 24b + 21c.
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