Add the following expressions using column method:
$a + b - 3 c, 2 a - b + 7 c, a - 4 b$

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Solution

Adding the given expressions:
Here each expression is written in a separate row such that the like terms are arranged one below the other. Then the addition of terms is carried out:
$a + b - 3 c 2 a - b + 7 c a - 4 b \bar{4 a - 4 b + 4 c}$
Hence, $a + b - 3 c, 2 a - b + 7 c, a - 4 b$ sums to $4 a - 4 b + 4 c$

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