Programmed Math/Subtraction
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Prerequisites: Addition
Subtraction deals with the taking away of numbers, like number a from number b so that: a >= b while b > a. Such a case is with:
20 - 10 = 10.
a = 20 and b = 10.
So a - b = 10, a >= b is true, and b > a is initially true.
Subtraction is the inverse of addition, meaning that it is the opposite.
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