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-21=0.007z
We move all terms to the left:
-21-(0.007z)=0
We add all the numbers together, and all the variables
-(+0.007z)-21=0
We get rid of parentheses
-0.007z-21=0
We move all terms containing z to the left, all other terms to the right
-0.007z=21
z=21/-0.007
z=-3000
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