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=1.6Y+2.1
We move all terms to the left:
-(1.6Y+2.1)=0
We get rid of parentheses
-1.6Y-2.1=0
We move all terms containing Y to the left, all other terms to the right
-1.6Y=2.1
Y=2.1/-1.6
Y=-1+0.5/1.6
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