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21=-3+z
We move all terms to the left:
21-(-3+z)=0
We add all the numbers together, and all the variables
-(z-3)+21=0
We get rid of parentheses
-z+3+21=0
We add all the numbers together, and all the variables
-1z+24=0
We move all terms containing z to the left, all other terms to the right
-z=-24
z=-24/-1
z=+24
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