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21+(z-3)=6z+5
We move all terms to the left:
21+(z-3)-(6z+5)=0
We get rid of parentheses
z-6z-3-5+21=0
We add all the numbers together, and all the variables
-5z+13=0
We move all terms containing z to the left, all other terms to the right
-5z=-13
z=-13/-5
z=2+3/5
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