Why is -4x-5 equal to positive 20? Justify your reasoning in 2 ways. ( e.g. with words, diagrams, a context, patterns, proof or numbers.)

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter1: Foundations
Section1.1: Use The Language Of Algebra
Problem 57E: Explain how you identify the like terms in the expression 8a2+4a+9a21 .
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Why is -4x-5 equal to positive 20? Justify your reasoning in 2 ways. ( e.g. with words, diagrams, a context, patterns, proof or numbers.)
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