Find the value of $x$ for which each of the following statements becomes true:
$45 + x = 45$

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Solution

If $a$ is any whole number, then $a + 0 = 0 + a = a .$ Here, zero is called the additive identity.
So, $45 + x = 45$
$∴ x = 0$
Hence, the required value of $x$ is $0 .$

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