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+12=7Z+6
We move all terms to the left:
+12-(7Z+6)=0
We get rid of parentheses
-7Z-6+12=0
We add all the numbers together, and all the variables
-7Z+6=0
We move all terms containing Z to the left, all other terms to the right
-7Z=-6
Z=-6/-7
Z=6/7
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