A negative number is indicated by a _ (underbar), not a - (minus).
5 + _3 2 _7 _7 _5e_3 _0.005 5 - 9 _4
Leaving out the blank between the - and the 9 does not change the meaning.
5 -9 _4
The - is always a verb. This simplifies the rules for evaluating sentences as there is no special case for - when it is used immediately to the left of a number. But if - is always a verb, then another character, the _ (underbar) is required to spell a negative number.
The _ is used in spelling numbers, along with the digits 0 1 2 3 4 5 6 7 8 9, dot ., and the e for exponential notation; it indicates a negative number.
Remember: _ in front of a number is part of the number and indicates that it is negative, and - is always a verb and is not part of a number.
The __ (two underbars) is negative infinity and is a number.
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