Add the following expressions using column method:
$a - b - c, 2 a - 5 b + 7 c, 3 c - b - a$

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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:
$a - b - c 2 a - 5 b + 7 c - a - b + 3 c \bar{2 a - 7 b + 9 c}$
Hence, $a - b - c, 2 a - 5 b + 7 c, 3 c - b - a$ sums to $2 a - 7 b + 9 c$

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