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21=z/2+17
We move all terms to the left:
21-(z/2+17)=0
We get rid of parentheses
-z/2-17+21=0
We multiply all the terms by the denominator
-z-17*2+21*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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