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The RULES for subtraction do not depend on the signs of the numbers. A - B means the value of A (+ or -) minus the value of B(+ or -). So if A is -1 and B is -2 you have (-1) - (-2). Subtracting a minus is a plus (like taking away a debt). So: (-1)+2 or -1+2 = 1. Think of positives as dollars in your hand, and minuses as bills in your hand you have to pay. If someone takes away a bill, you are better off. Similarly for distances. So it does matter - you must do it properly.

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12y ago

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