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z/2+7=8=z/2
We move all terms to the left:
z/2+7-(8)=0
We add all the numbers together, and all the variables
z/2-1=0
We multiply all the terms by the denominator
z-1*2=0
We add all the numbers together, and all the variables
z-2=0
We move all terms containing z to the left, all other terms to the right
z=2
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