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Addition and Subtraction of Algebraic Expression

Subtract: a+...

Question

Subtract:
$a + 2 b - c$ from $3 a - b + 2 c$

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Solution

$3 a - b + 2 c - (a + 2 b - c)$
$= 3 a - b + 2 c - a - 2 b + c$
$= 3 a - a - b - 2 b + 2 c + c$
$= 2 a - 3 b + 3 c$

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