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13.1-0.1z=8.2
We move all terms to the left:
13.1-0.1z-(8.2)=0
We add all the numbers together, and all the variables
-0.1z+4.9=0
We move all terms containing z to the left, all other terms to the right
-0.1z=-4.9
z=-4.9/-0.1
z=+49
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