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2z=40+12z
We move all terms to the left:
2z-(40+12z)=0
We add all the numbers together, and all the variables
2z-(12z+40)=0
We get rid of parentheses
2z-12z-40=0
We add all the numbers together, and all the variables
-10z-40=0
We move all terms containing z to the left, all other terms to the right
-10z=40
z=40/-10
z=-4
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