Question 598515
-2x + 3y - 4z - w =  1
  x + 2y + 2z - w = -2
  x - 5y + 2z     =  1


how do I solve this equation?
---------------
It's not an equation.  It's a system of equations, since there's more than one.
----
There are 4 variables, but only 3 equations.
--> no unique solution, an infinite # of solutions