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=-5+4.2Y
We move all terms to the left:
-(-5+4.2Y)=0
We add all the numbers together, and all the variables
-(4.2Y-5)=0
We get rid of parentheses
-4.2Y+5=0
We move all terms containing Y to the left, all other terms to the right
-4.2Y=-5
Y=-5/-4.2
Y=1+0.8/4.2
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