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-5=z/2+1
We move all terms to the left:
-5-(z/2+1)=0
We get rid of parentheses
-z/2-1-5=0
We multiply all the terms by the denominator
-z-1*2-5*2=0
We add all the numbers together, and all the variables
-1z-12=0
We move all terms containing z to the left, all other terms to the right
-z=12
z=12/-1
z=-12
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