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8.3-z=131.7
We move all terms to the left:
8.3-z-(131.7)=0
We add all the numbers together, and all the variables
-1z-123.4=0
We move all terms containing z to the left, all other terms to the right
-z=123.4
z=123.4/-1
z=-123+0.40000000000001/1
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