How would you convince someone that (x - 4)/(4 - x) = -1 for all real numbers except 4?

Intermediate Algebra
10th Edition
ISBN:9781285195728
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter4: Rational Expressions
Section4.1: Simplifying Rational Expressions
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How would you convince someone that (x - 4)/(4 - x) = -1 for all real numbers except 4?

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