If you have $20 and spend $10, you will have $10 remaining. In terms of a point on a horizontal line, let's say the point representing $20 is at the rightmost end and the point representing $0 is at the leftmost end.
If you start at the point representing $20 and move $10 to the left, the point representing $10 (your remaining money) would move towards the left but not completely to the leftmost end.
If i have 20 dollars and pen 10 which direction would the point representing you have remaining move on the horizontal line
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