Answer :
Start from 0 and count four spaces to the right to negative four. Then count six spaces to the left until you end up with your answer, which is two.
4 3 2 1 0. -1. -2. -3. -4
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4 3 2 1 0. -1. -2. -3. -4
---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---