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+84=6Z-72
We move all terms to the left:
+84-(6Z-72)=0
We get rid of parentheses
-6Z+72+84=0
We add all the numbers together, and all the variables
-6Z+156=0
We move all terms containing Z to the left, all other terms to the right
-6Z=-156
Z=-156/-6
Z=+26
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