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-840=10.5(Y-40)
We move all terms to the left:
-840-(10.5(Y-40))=0
We calculate terms in parentheses: -(10.5(Y-40)), so:We get rid of parentheses
10.5(Y-40)
We multiply parentheses
10.5Y-420
Back to the equation:
-(10.5Y-420)
-10.5Y+420-840=0
We add all the numbers together, and all the variables
-10.5Y-420=0
We move all terms containing Y to the left, all other terms to the right
-10.5Y=420
Y=420/-10.5
Y=-40
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