Subtract $2 a - b - c f r o m 3 a + b + c$ using horizontal method.

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Solution

Given that: Subtract $2 a - b - c f r o m 3 a + b + c$ using the horizontal method.
Subtracting $2 a - b - c f r o m 3 a + b + c$ using the horizontal method:
$= 3 a + b + c - (2 a - b - c)$
$= 3 a + b + c - 2 a + b + c = (3 a - 2 a) + (b + b) + (c + c) = a + 2 b + 2 c$ ( Re-grouping the terms)
Therefore, we get $a + 2 b + 2 c$ .

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