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7(2l+1)=133
We move all terms to the left:
7(2l+1)-(133)=0
We multiply parentheses
14l+7-133=0
We add all the numbers together, and all the variables
14l-126=0
We move all terms containing l to the left, all other terms to the right
14l=126
l=126/14
l=9
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