What does a positive minus a negative equal to

Positive number
Subtracting a number is equal to adding the opposite of the number, so it must be a positive number

Why can a negative number minus a positive number get a positive number? What concept? I can't express it on the number axis, and I can't figure it out. For example: 10 - (- 10 = 20? Why can two negative signs get a positive number? I can't figure it out!

A positive number minus a negative number is a positive number = a positive number plus a positive number

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