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=4.2Y-9.5
We move all terms to the left:
-(4.2Y-9.5)=0
We get rid of parentheses
-4.2Y+9.5=0
We move all terms containing Y to the left, all other terms to the right
-4.2Y=-9.5
Y=-9.5/-4.2
Y=2+1/3.8181818181818
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