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=12Y+8.5
We move all terms to the left:
-(12Y+8.5)=0
We get rid of parentheses
-12Y-8.5=0
We move all terms containing Y to the left, all other terms to the right
-12Y=8.5
Y=8.5/-12
Y=-1.8888888888889/2.6666666666667
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