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84=7z-14
We move all terms to the left:
84-(7z-14)=0
We get rid of parentheses
-7z+14+84=0
We add all the numbers together, and all the variables
-7z+98=0
We move all terms containing z to the left, all other terms to the right
-7z=-98
z=-98/-7
z=+14
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