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-5Z=7Z-9
We move all terms to the left:
-5Z-(7Z-9)=0
We get rid of parentheses
-5Z-7Z+9=0
We add all the numbers together, and all the variables
-12Z+9=0
We move all terms containing Z to the left, all other terms to the right
-12Z=-9
Z=-9/-12
Z=3/4
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