Sistema escalonado: 1) No sistema
{ 2 x + 3 y + z = 1 
3 x - 3 y + z = 8
2 y + z = 0

 o valor de z - x - y = ??


2) No sistema
{ 2 x - y + z = 1 
x + 2 y - z = -3
3 x + 4 y + 2 z = -5

qual o valor de x + y + z ?

3) Lendo o sistema
{ x - y + z = 0 
2 x + y - 3 z = -12
x + y - z = -4

admite a solução única. Então a soma x+y+z=?
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