8,6-(-z)=0 (-z)-50,2=0 -67+(-z)=0

Question

8,6-(-z)=0
(-z)-50,2=0
-67+(-z)=0

Answer 1

1.8,6+z=o
z=-8,6

2. -z-50,2=o
-z=50,2
z=-50,2
3. -67-z=o
-z=67
z=-67