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=2.4Y-4.2
We move all terms to the left:
-(2.4Y-4.2)=0
We get rid of parentheses
-2.4Y+4.2=0
We move all terms containing Y to the left, all other terms to the right
-2.4Y=-4.2
Y=-4.2/-2.4
Y=1+1/1.3333333333333
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