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-3z=8-12
We move all terms to the left:
-3z-(8-12)=0
We add all the numbers together, and all the variables
-3z-(-4)=0
We add all the numbers together, and all the variables
-3z+4=0
We move all terms containing z to the left, all other terms to the right
-3z=-4
z=-4/-3
z=1+1/3
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