Find the additive inverse of 5.

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Hint: In order to solve this question we need to have the understanding of additive inverse. After knowing what additive inverse is, we just have to formulate an equation by using its definition. So if we take x as the additive inverse, then we must add it with the given number and equate it to 0. Solving it for x will give us the answer of the given question.

Let assume that there is a number $a$ , then the additive inverse of the number $a$ is the number that, when added to $a$ , yields zero.
Let suppose that the additive inverse of 5 is $x$ .
$\therefore x+5=0$
$\Rightarrow x=-5$