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## Homework Statement

Dear Mentors and PF helpers,

I saw this question on a book but couldn't understand one part of it.

Here the question:

Solve the following inequality

I copied the solution as below

## Homework Equations

## The Attempt at a Solution

I don't understand why the numerator in step (1) can become 1 in step (2).

Can someone explain the concept behind.

Thank you for your time