[m] λ =\frac{1}{4}
x_(M)=(x_(A)+([red]1/4[/red])*x_(B))/(1+([red]1/4[/red]))
y_(M)=(y_(A)+([red]1/4[/red])*y_(B))/(1+([red]1/4[/red]))
z_(M)=(z_(A)+([red]1/4[/red])*z_(B))/(1+([red]1/4[/red]))
-1=(2+([red]1/4[/red])*x_(B))/(1+([red]1/4[/red])) ⇒ -1=(2+(1/4)x_(B))/(5/4) ⇒ 2+(1/4)x_(B)=-5/4 ⇒ x_(B)=-13
2=(-3+([red]1/4[/red])*y_(B))/(1+([red]1/4[/red])) ⇒ y_(B)=22
5=(4+([red]1/4[/red])*z_(B))/(1+([red]1/4[/red])) ⇒ z_(B)=9