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Addition and Subtraction of Algebraic Expression

Find the sum ...

Question

Find the sum of $- x y z, - 2 x y z, 7 x y z, - x y z$

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Solution

Given, $- x y z + (- 2 x y z) + 7 x y z + (- x y z)$

$= (- x y z - 2 x y z) + (7 x y z - x y z)$

$= - 3 x y z + 6 x y z$

$= 3 x y z$

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