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=2Y(1)-7
We move all terms to the left:
-(2Y(1)-7)=0
We add all the numbers together, and all the variables
-(2Y-7)=0
We get rid of parentheses
-2Y+7=0
We move all terms containing Y to the left, all other terms to the right
-2Y=-7
Y=-7/-2
Y=3+1/2
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