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4(2l+1)=28
We simplify the equation to the form, which is simple to understand
4(2l+1)=28
Reorder the terms in parentheses
+(+8l+4)=28
Remove unnecessary parentheses
+8l+4=+28
We move all terms containing l to the left and all other terms to the right.
+8l=+28-4
We simplify left and right side of the equation.
+8l=+24
We divide both sides of the equation by 8 to get l.
l=3
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