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1) 40+(-z)=0
2) (-z)-50,2=0
3) -67+(z)=0
4) -(-z)+100=0
1) 40+(-z)=0
2) (-z)-50,2=0
3) -67+(z)=0
4) -(-z)+100=0
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40-z=0
z = 40
2) (-z)-50,2=0
-z-50,2=0
-z = 50,2
z = -50,2
3) -67+(z)=0
-67+z=0
z = 67
4) -(-z)+100=0
z+100 = 0
z = -100