Lemma
EasyIntegers
OpenStax, Elementary Algebra 2e §1.3 Add and Subtract Integers · Exercise 15 · Arithmetic · Integers

Add and Subtract Integers · Exercise 15

Simplify.

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OpenStax, Elementary Algebra 2e · §1.3 Add and Subtract Integers · Exercise 15

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Checked against the answer in OpenStax, Elementary Algebra 2e.