42=2(l+9)

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Solution for 42=2(l+9) equation: 



42=2(l+9)

We move all terms to the left:

42-(2(l+9))=0



We calculate terms in parentheses: -(2(l+9)), so:

2(l+9)

We multiply parentheses

2l+18

Back to the equation:

-(2l+18)



We get rid of parentheses

-2l-18+42=0

We add all the numbers together, and all the variables

-2l+24=0

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

-2l=-24

l=-24/-2

l=+12

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