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-3.5z=2.31
We move all terms to the left:
-3.5z-(2.31)=0
We add all the numbers together, and all the variables
-3.5z-2.31=0
We move all terms containing z to the left, all other terms to the right
-3.5z=2.31
z=2.31/-3.5
z=-2.31/3.5
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