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5-z/7=12
We move all terms to the left:
5-z/7-(12)=0
We add all the numbers together, and all the variables
-z/7-7=0
We multiply all the terms by the denominator
-z-7*7=0
We add all the numbers together, and all the variables
-1z-49=0
We move all terms containing z to the left, all other terms to the right
-z=49
z=49/-1
z=-49
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