When we want to add two numbers with different signs, we have to subtract their absolute values and take the sign of the number with the greater absolute value.
In the case of 5 and -12, we have to subtract the absolute value of -12 from 5, which is equivalent to adding 5 and 12. The result is 17.
Since -12 has a greater absolute value than 5, we take its sign, giving us a final answer of -17.
Therefore, 5 + (-12) = -7
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