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-13=z/2
We move all terms to the left:
-13-(z/2)=0
We add all the numbers together, and all the variables
-(+z/2)-13=0
We get rid of parentheses
-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
-1z-26=0
We move all terms containing z to the left, all other terms to the right
-z=26
z=26/-1
z=-26
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