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8z+12-12z=-12.z=
We move all terms to the left:
8z+12-12z-(-12.z)=0
We add all the numbers together, and all the variables
8z-12z-(-12z)+12=0
We add all the numbers together, and all the variables
-4z-(-12z)+12=0
We get rid of parentheses
-4z+12z+12=0
We add all the numbers together, and all the variables
8z+12=0
We move all terms containing z to the left, all other terms to the right
8z=-12
z=-12/8
z=-1+1/2
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