To add the two numbers, we start at 28 on the number line and count 12 spaces to the left since the -12 means we are subtracting 12 from 28.
Starting at 28, we can count back 10 spaces, which brings us to 18.
Then, we can count back 2 more spaces, which brings us to 16.
Therefore, 28 + (-12) = 16.
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