3 1/6+(-2 4/9-(-1 2/3)) =3 1/6+(- (22+15)/9))=3 1/6+(- 37/9)=3 1/6+(-4 1/9)=3 1/6-4 1/9=19/6-37/9=(57-74)/18=-17/18
3 1/6+(-2 4/9-(-1 2/3)) =3 1/6+(- (22+15)/9))=3 1/6+(- 37/9)=3 1/6+(-4 1/9)=3 1/6-4 1/9=19/6-37/9=(57-74)/18=-17/18