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-4z-z=4z-2-8z
We move all terms to the left:
-4z-z-(4z-2-8z)=0
We add all the numbers together, and all the variables
-4z-z-(-4z-2)=0
We add all the numbers together, and all the variables
-5z-(-4z-2)=0
We get rid of parentheses
-5z+4z+2=0
We add all the numbers together, and all the variables
-1z+2=0
We move all terms containing z to the left, all other terms to the right
-z=-2
z=-2/-1
z=+2
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