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l+l+l=3l-10+l+3l-10
We simplify the equation to the form, which is simple to understand
l+l+l=3l-10+l+3l-10
We move all terms containing l to the left and all other terms to the right.
+1l+1l+1l-3l-1l-3l=-10-10
We simplify left and right side of the equation.
-4l=-20
We divide both sides of the equation by -4 to get l.
l=5
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