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In this video I will show a quick way to determine whether the final number is negative or positive. ODD number of negative means the number is negative. EVEN umber of negative means the number is positive. -3=?, -(-3)=?, -(-(-3))=?, -(-(-(-3)))=?, 4-(-3)=?, 4-(-3+9)=?

Next video in this series can be seen at:
https://youtu.be/OVl_0hZLGrc