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6(2l+3)=78
We move all terms to the left:
6(2l+3)-(78)=0
We multiply parentheses
12l+18-78=0
We add all the numbers together, and all the variables
12l-60=0
We move all terms containing l to the left, all other terms to the right
12l=60
l=60/12
l=5
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