2 answers:
Ah, let me help you on this one.
These weird lines (|) are actually indicators of absolute value.
All of the negative numbers will be transformed into non-negative ones.
Neat, huh?
13+26-18+12 equals to 33
P.S. If this answer helped you, please, make sure to say "Thanks" just below my answer. It will help me a lot.
33
The lines stand for absolute value. The expression would then look like:
13+26-18+12
39-18+12
21+12
33
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