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450-30=z+29
We move all terms to the left:
450-30-(z+29)=0
We add all the numbers together, and all the variables
-(z+29)+420=0
We get rid of parentheses
-z-29+420=0
We add all the numbers together, and all the variables
-1z+391=0
We move all terms containing z to the left, all other terms to the right
-z=-391
z=-391/-1
z=+391
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