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12=z/2+8
We move all terms to the left:
12-(z/2+8)=0
We get rid of parentheses
-z/2-8+12=0
We multiply all the terms by the denominator
-z-8*2+12*2=0
We add all the numbers together, and all the variables
-1z+8=0
We move all terms containing z to the left, all other terms to the right
-z=-8
z=-8/-1
z=+8
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