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-0.2z+0.8=-0.1z
We move all terms to the left:
-0.2z+0.8-(-0.1z)=0
We get rid of parentheses
-0.2z+0.1z+0.8=0
We add all the numbers together, and all the variables
-0.1z+0.8=0
We move all terms containing z to the left, all other terms to the right
-0.1z=-0.8
z=-0.8/-0.1
z=+8
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