#### Answer

$4$

#### Work Step by Step

The addends (numbers being added have) different signs.
To add two numbers with different signs, perform the following steps:
(1) Subtract their absolute values.
$|12|-|-8|=12-8=4$
(2) Use the sign of the number with the bigger absolute value.
$12+(-8)=4$
Thus, the sum is $4$.