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86.5=2l+40.75(2l-4)
We move all terms to the left:
86.5-(2l+40.75(2l-4))=0
We calculate terms in parentheses: -(2l+40.75(2l-4)), so:We get rid of parentheses
2l+40.75(2l-4)
We multiply parentheses
2l+81.5l-163
We add all the numbers together, and all the variables
83.5l-163
Back to the equation:
-(83.5l-163)
-83.5l+163+86.5=0
We add all the numbers together, and all the variables
-83.5l+249.5=0
We move all terms containing l to the left, all other terms to the right
-83.5l=-249.5
l=-249.5/-83.5
l=2+55/55.666666666667
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