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210=l(1-0.1)
We move all terms to the left:
210-(l(1-0.1))=0
We add all the numbers together, and all the variables
-(l(0.9))+210=0
We calculate terms in parentheses: -(l(0.9)), so:We add all the numbers together, and all the variables
l(0.9)
We multiply parentheses
0.9l
Back to the equation:
-(0.9l)
-(+0.9l)+210=0
We get rid of parentheses
-0.9l+210=0
We move all terms containing l to the left, all other terms to the right
-0.9l=-210
l=-210/-0.9
l=233+0.29999999999998/0.9
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