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