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=2.25Y-1.5
We move all terms to the left:
-(2.25Y-1.5)=0
We get rid of parentheses
-2.25Y+1.5=0
We move all terms containing Y to the left, all other terms to the right
-2.25Y=-1.5
Y=-1.5/-2.25
Y=1/1.5
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