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Addition and Subtraction of Algebraic Expression

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Question

Add the following algebraic expression using both horizontal and vertical methods. Did you get the same answer with both methods.
$2 x + 9 y - 7 z; 3 y + z + 3 x; 2 x - 4 y - z$

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Solution

$\begin{matrix} A d d h o r i z o n t a l l y \Rightarrow 2 x + 9 y - 7 z + 3 y + z + 3 x + 2 x - 4 y - z \Rightarrow 7 x + 8 y - 7 z a d d v e r t i c a l l y \Rightarrow 2 x + 9 y - 7 z \Rightarrow 3 x + 3 y + z \Rightarrow 2 x - 4 y - z \Rightarrow ¯ ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ ¯ 7 x + 8 y - 7 z \end{matrix}$

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