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2z=6z-40
We move all terms to the left:
2z-(6z-40)=0
We get rid of parentheses
2z-6z+40=0
We add all the numbers together, and all the variables
-4z+40=0
We move all terms containing z to the left, all other terms to the right
-4z=-40
z=-40/-4
z=+10
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