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13=z/2+11
We move all terms to the left:
13-(z/2+11)=0
We get rid of parentheses
-z/2-11+13=0
We multiply all the terms by the denominator
-z-11*2+13*2=0
We add all the numbers together, and all the variables
-1z+4=0
We move all terms containing z to the left, all other terms to the right
-z=-4
z=-4/-1
z=+4
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