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2-3z=7z-
We move all terms to the left:
2-3z-(7z-)=0
We add all the numbers together, and all the variables
-3z-(+7z)+2=0
We get rid of parentheses
-3z-7z+2=0
We add all the numbers together, and all the variables
-10z+2=0
We move all terms containing z to the left, all other terms to the right
-10z=-2
z=-2/-10
z=1/5
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