Question
Add $: 3a - 4b + 4c, 2a + 3b - 8c, a - 6b + c$

Answer

Writing the terms of the given expressions (in the same order) in the form of rows with like terms below each other and adding column-wise, we get:
$3 a-4 b+4 c$
$2 a+3 b-8 c$
$a-6 b+c$
$\overline{6 a-7 b-3} c$

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