l+l+12=80

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Solution for l+l+12=80 equation: 



l+l+12=80

We move all terms to the left:

l+l+12-(80)=0

We add all the numbers together, and all the variables

2l-68=0

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

2l=68

l=68/2

l=34

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