Question 187011
equation 1 + equation 2
=> 2(x+z) = 3
  x+z = 3/2
equation 1 +equation3
=>2x = 3
=> x = 3/2

equation 2+quation3 
=> 2(x-y) =1
  x-y = 1/2
y = 1

equationj 1 substitute the values of x and y
=>z=-1/2