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-6z-2z-(-4z)=-8
We move all terms to the left:
-6z-2z-(-4z)-(-8)=0
We add all the numbers together, and all the variables
-8z-(-4z)+8=0
We get rid of parentheses
-8z+4z+8=0
We add all the numbers together, and all the variables
-4z+8=0
We move all terms containing z to the left, all other terms to the right
-4z=-8
z=-8/-4
z=+2
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