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4z-2z+4z-3z+3z=12
We move all terms to the left:
4z-2z+4z-3z+3z-(12)=0
We add all the numbers together, and all the variables
6z-12=0
We move all terms containing z to the left, all other terms to the right
6z=12
z=12/6
z=2
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