Add the following :
$(- 6) + (- 3) + (- 7)$

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Solution

Addition of given integers
$\Rightarrow (- 6) + (- 3) + (- 7)$
In addition when two sign $(+) (-)$ can replaced by $-$ sign
$= (- 6 - 3 - 7)$
Now all digits are negative add all digits and put negative sign in front of obtained number
$= (- 9 - 7)$
$= (- 16)$
Therefore, addition of $(- 6) + (- 3) + (- 7)$ is $(- 16)$ .

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