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z/2=5+8
We move all terms to the left:
z/2-(5+8)=0
We add all the numbers together, and all the variables
z/2-13=0
We multiply all the terms by the denominator
z-13*2=0
We add all the numbers together, and all the variables
z-26=0
We move all terms containing z to the left, all other terms to the right
z=26
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