Axiomatic ProofsProve -(-a)=a for all integers a

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 13RE
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Axiomatic Proofs

Prove -(-a)=a for all integers a

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