The mistake
Where is the mistake?
There is no equivalence between line 1 and 2 (the first transformation of the inequality) and subsequently no equivalence between the antecedent and the consequent. It is a poor piece of analysis and there is also no synthesis.
What is the mistake?
![What is the mistake?](https://beta.geogebra.org/resource/Gr85aP2E/egc7EnF1UuiPifVv/material-Gr85aP2E.png)
Why is it a mistake?
![Why is it a mistake?](https://beta.geogebra.org/resource/ka6uqiUe/zQVBOfs1UWwC5xZT/material-ka6uqiUe.png)
![Image](https://beta.geogebra.org/resource/xfxVqQ4Z/p7bfJrSFmjbEiQEG/material-xfxVqQ4Z.png)