Add the following:
$5 a b c, - 3 a b c, 2 a b c, 8 a b c$

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Solution

Given, polynomial are $5 a b c, - 3 a b c, 2 a b c, 8 a b c$ .
Adding the given terms,
$= 5 a b c + (- 3 a b c) + 2 a b c + 8 a b c = (5 - 3 + 2 + 8) a b c = 12 a b c$
Hence, the sum of $5 a b c, - 3 a b c, 2 a b c, 8 a b c$ is $12 a b c$ .

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