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-1-(-z)=-2
We move all terms to the left:
-1-(-z)-(-2)=0
We add all the numbers together, and all the variables
-(-1z)-1-(-2)=0
We add all the numbers together, and all the variables
-(-1z)+1=0
We get rid of parentheses
1z+1=0
We add all the numbers together, and all the variables
z+1=0
We move all terms containing z to the left, all other terms to the right
z=-1
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