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2z=4z-13
We move all terms to the left:
2z-(4z-13)=0
We get rid of parentheses
2z-4z+13=0
We add all the numbers together, and all the variables
-2z+13=0
We move all terms containing z to the left, all other terms to the right
-2z=-13
z=-13/-2
z=6+1/2
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