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Addition and Subtraction of Integers

What must be ...

Question

What must be added to $- 23$ to get $- 9$ ?

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Solution

Let the number to be added $= x$
$∴ - 23 + x = - 9$
$∴$ The required number $= - 9 - (- 23)$
$= - 9 + 23 = 14$

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