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z/2=2.1
We move all terms to the left:
z/2-(2.1)=0
We add all the numbers together, and all the variables
z/2-2.1=0
We multiply all the terms by the denominator
z-(2.1)*2=0
We add all the numbers together, and all the variables
z-4.2=0
We move all terms containing z to the left, all other terms to the right
z=4.2
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