Respuesta :

Add 44 to both sides
-44-9z+44=-31-3z+44
simplify
-9z=-3z+13
Add 3z to both sides
-9z+3z=-3z+13+3z
simplify
-6z=13
DIvide -6 to both sides
{-6z}/{-6}={13}/{-6}
Answer
z=-{13}/{6}