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100=7z+2
We move all terms to the left:
100-(7z+2)=0
We get rid of parentheses
-7z-2+100=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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