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4(2l+1)=20
We move all terms to the left:
4(2l+1)-(20)=0
We multiply parentheses
8l+4-20=0
We add all the numbers together, and all the variables
8l-16=0
We move all terms containing l to the left, all other terms to the right
8l=16
l=16/8
l=2
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