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30l+240=50l-160=
We move all terms to the left:
30l+240-(50l-160)=0
We get rid of parentheses
30l-50l+160+240=0
We add all the numbers together, and all the variables
-20l+400=0
We move all terms containing l to the left, all other terms to the right
-20l=-400
l=-400/-20
l=+20
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