Question

How to solve integers problems with big numbers

Answer 1

`\Huge \boxed{-3}`

Explanation:

To solve this problem, first you have to use add & subtract integers from left to right. Additive inverse is a opposite of a number. Additive inverse are the same distance from zero. The absolute value are the same.

First, add & subtract numbers from left to right.

`\displaystyle -21+18=-3`

Therefore, the correct is -3.

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