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=400+30Y
We move all terms to the left:
-(400+30Y)=0
We add all the numbers together, and all the variables
-(30Y+400)=0
We get rid of parentheses
-30Y-400=0
We move all terms containing Y to the left, all other terms to the right
-30Y=400
Y=400/-30
Y=-13+1/3
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