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-1.5z=12.5
We move all terms to the left:
-1.5z-(12.5)=0
We add all the numbers together, and all the variables
-1.5z-12.5=0
We move all terms containing z to the left, all other terms to the right
-1.5z=12.5
z=12.5/-1.5
z=-8+0.5/1.5
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