20=2(l+40)

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Solution for 20=2(l+40) equation: 



20=2(l+40)

We move all terms to the left:

20-(2(l+40))=0



We calculate terms in parentheses: -(2(l+40)), so:

2(l+40)

We multiply parentheses

2l+80

Back to the equation:

-(2l+80)



We get rid of parentheses

-2l-80+20=0

We add all the numbers together, and all the variables

-2l-60=0

We move all terms containing l to the left, all other terms to the right

-2l=60

l=60/-2

l=-30

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