Isotopes of the free algebra of type $(-1,1)$ with three generators

This work is devoted to the research of isotopes of algebras of type $(-1,1)$ with three generators. It has been proved that the isotopes of the free algebra of the variety $M_3$ belong to this variety, while the isotopes of an arbitrary algebra from $M_3$ need not even be algebras of type $(-1,1)$.