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

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Solution

Find the sum.
Given, $2 a - 3 b + 4 c, a - b - 2 c$
To find the sum of expressions we need to add their like terms. So, we arrange the given expressions in line such that the like terms will be in the same vertical column. Then, we can add each column.
By using column method we get,
$2 a - 3 b + 4 c + a - b - 2 c3 a - 4 b + 2 c$
Hence, the final answer is $3 a - 4 b + 2 c$

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2 a - [3 b - {a - (2 c - 3 b) + 4 c - 3 (a - b - 2 c)}]

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$2 a - [3 b - \{a - (2 c - 3 b) + 4 c - 3 (a - b - 2 c)\}]$

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