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8.5=4.2-z
We move all terms to the left:
8.5-(4.2-z)=0
We add all the numbers together, and all the variables
-(-1z+4.2)+8.5=0
We get rid of parentheses
1z-4.2+8.5=0
We add all the numbers together, and all the variables
z+4.3=0
We move all terms containing z to the left, all other terms to the right
z=-4.3
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