It is true that we obtain this result by subtracting 3 from io by means of a subtractiontable (concrete or ideal); but this table merely gives the generalized results of a number of operations of addition or subtraction performed with concrete units.
subtracting הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד