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+17=2Z+15
We move all terms to the left:
+17-(2Z+15)=0
We get rid of parentheses
-2Z-15+17=0
We add all the numbers together, and all the variables
-2Z+2=0
We move all terms containing Z to the left, all other terms to the right
-2Z=-2
Z=-2/-2
Z=1
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