To solve the expression \( -1223 - (-856) \) using the additive inverse, we first recognize that subtracting a negative number is equivalent to adding its positive:
\[ -1223 - (-856) = -1223 + 856 \]
Now we can perform the addition:
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First, we can find the absolute values of the two numbers:
- The absolute value of \( -1223 \) is \( 1223 \).
- The absolute value of \( 856 \) is \( 856 \).
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Since \( 1223 \) is greater than \( 856 \), we will subtract \( 856 \) from \( 1223 \):
\[ 1223 - 856 = 367 \]
- Since \( -1223 \) has the greater absolute value, the result will retain the negative sign. Therefore:
\[ -1223 + 856 = -367 \]
So the result of \( -1223 - (-856) \) is:
\[ -367 \]
If you would like to express \(-367\) as a mixed number, it can be represented as:
\[ -367 = -367 \frac{0}{1} \]
Since it's already a whole number, no additional fractions are necessary. Thus, the mixed number form is simply:
\[ -367 \]
Therefore, the answer is \(-367\). If there is a misunderstanding about the expected format for your answer or if there is additional context needed, please let me know!