Solve the following.
$- 10 + (- 31) - (- 21) + 5$

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Solution

$- 10 + (- 31) - (- 21) + 5 = - 10 - 31 + 21 + 5$ $[∵ (-) (-) = (+)]$
$= - 41 + 21 + 5 = - 41 + 26 = - 15$
Hence, $- 15$ is the required answer.

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