Respuesta:
a) [tex]x=-\frac{5-y-z}{2}[/tex]
b) [tex]x=-2+2y-z[/tex]
c) [tex]x=-3-y+2z[/tex]
Explicación paso a paso:
a)Procedimiento:
[tex]-2x+y+z=5\\\\-2x+y+z-\left(y+z\right)=5-\left(y+z\right)\\\\-2x=5-y-z\\\\\frac{-2x}{-2}=\frac{5}{-2}-\frac{y}{-2}-\frac{z}{-2}\\\\x=-\frac{5-y-z}{2}[/tex]
b)Procedimiento:
[tex]x-2y+z=-2\\\\x-2y+z-\left(-2y+z\right)=-2-\left(-2y+z\right)\\\\x=-2+2y-z[/tex]
c) Procedimiento:
[tex]x+y-2z=-3\\\\x+y-2z-\left(y-2z\right)=-3-\left(y-2z\right)\\\\x=-3-y+2z[/tex]
