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-9Y+18=2Y-12
We move all terms to the left:
-9Y+18-(2Y-12)=0
We get rid of parentheses
-9Y-2Y+12+18=0
We add all the numbers together, and all the variables
-11Y+30=0
We move all terms containing Y to the left, all other terms to the right
-11Y=-30
Y=-30/-11
Y=2+8/11
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