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12z=7z-8+4z
We move all terms to the left:
12z-(7z-8+4z)=0
We add all the numbers together, and all the variables
12z-(11z-8)=0
We get rid of parentheses
12z-11z+8=0
We add all the numbers together, and all the variables
z+8=0
We move all terms containing z to the left, all other terms to the right
z=-8
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