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62.1=6.9z
We move all terms to the left:
62.1-(6.9z)=0
We add all the numbers together, and all the variables
-(+6.9z)+62.1=0
We get rid of parentheses
-6.9z+62.1=0
We move all terms containing z to the left, all other terms to the right
-6.9z=-62.1
z=-62.1/-6.9
z=+9
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