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l+l+l-2=16
We simplify the equation to the form, which is simple to understand
l+l+l-2=16
We move all terms containing l to the left and all other terms to the right.
+1l+1l+1l=+16+2
We simplify left and right side of the equation.
+3l=+18
We divide both sides of the equation by 3 to get l.
l=6
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