Answer:
$0
Explanation:
<---*-12*------------0------------*12*--->
You start from negative twelve and add 12.
count up 12 spaces
<---*-12*_-11_-10_-9_-8_-7_-6 _-5_-4_-3_-2 _-1 _0_1_2_3_4_5_6_7_8_9_10....
⬆
*start here*
or if you understand it better like this...
-12 + (1 x 12)
or if you still cant wrap your brain around it...
-12 + 12 = 0
I don't know how you learn best so I put it in three ways :]
<3 Enjoy,
Dea