no
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yes because it is the same as adding positive (it is easier to use a numberline)
Subtracting a negative is the same as adding the equivalent positive. For example, subtracting minus 10 is the same as adding 10.
It means they're the same size number, although they might not be both positives or both negatives. In other words, they are the same distance from zero.
= What are the positives and the negatives of the primary source? =
-40 is the only one. There isn't any positive number.