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Adding is the opposite of subtracting
Subtracting a fraction is the same as adding its negative.
Subtracting a negative is the same as adding the equivalent positive. For example, subtracting minus 10 is the same as adding 10.
Addition and subtraction can be thought of as the same thing because subtracting a negative number is the same as adding it and adding a negative number is the same as subtracting it.
Adding a negative is the same as subtracting a positive. 9 - 9 = 0 9 + (-9) = 0