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=-Y+4.5
We move all terms to the left:
-(-Y+4.5)=0
We add all the numbers together, and all the variables
-(-1Y+4.5)=0
We get rid of parentheses
1Y-4.5=0
We add all the numbers together, and all the variables
Y-4.5=0
We move all terms containing Y to the left, all other terms to the right
Y=4.5
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