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57=10z+7
We move all terms to the left:
57-(10z+7)=0
We get rid of parentheses
-10z-7+57=0
We add all the numbers together, and all the variables
-10z+50=0
We move all terms containing z to the left, all other terms to the right
-10z=-50
z=-50/-10
z=+5
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