Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 35: 59

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For example: -5 - (-5) = 0 and -5 + (-5) = -10 -As you can see, adding two negatives may result in a smaller number than subtracting two negatives; therefore, the difference between two numbers isn't necessarily always less than the sum of those two numbers.