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0.9-0.4z=5.7
We move all terms to the left:
0.9-0.4z-(5.7)=0
We add all the numbers together, and all the variables
-0.4z-4.8=0
We move all terms containing z to the left, all other terms to the right
-0.4z=4.8
z=4.8/-0.4
z=-11+0.4/0.4
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