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2l+2(1/2l+1)=30
We move all terms to the left:
2l+2(1/2l+1)-(30)=0
Domain of the equation: 2l+1)!=0We multiply parentheses
l∈R
2l+2l+2-30=0
We add all the numbers together, and all the variables
4l-28=0
We move all terms containing l to the left, all other terms to the right
4l=28
l=28/4
l=7
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