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100=2(l+20)
We simplify the equation to the form, which is simple to understand
100=2(l+20)
Reorder the terms in parentheses
100=+(+2l+40)
Remove unnecessary parentheses
+100=+2l+40
We move all terms containing l to the left and all other terms to the right.
-2l=+40-100
We simplify left and right side of the equation.
-2l=-60
We divide both sides of the equation by -02 to get l.
l=30
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