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=3.5Y+3.9
We move all terms to the left:
-(3.5Y+3.9)=0
We get rid of parentheses
-3.5Y-3.9=0
We move all terms containing Y to the left, all other terms to the right
-3.5Y=3.9
Y=3.9/-3.5
Y=-1+0.4/3.5
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