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=640(0.23)Y
We move all terms to the left:
-(640(0.23)Y)=0
We calculate terms in parentheses: -(640(0.23)Y), so:We add all the numbers together, and all the variables
640(0.23)Y
We multiply parentheses
147.2Y
Back to the equation:
-(147.2Y)
-(+147.2Y)=0
We get rid of parentheses
-147.2Y=0
Y=0/-147.2
Y=0
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