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z/2=4-z/2
We move all terms to the left:
z/2-(4-z/2)=0
We add all the numbers together, and all the variables
z/2-(-z/2+4)=0
We get rid of parentheses
z/2+z/2-4=0
We multiply all the terms by the denominator
z+z-4*2=0
We add all the numbers together, and all the variables
2z-8=0
We move all terms containing z to the left, all other terms to the right
2z=8
z=8/2
z=4
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