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3.9l=10.8
We move all terms to the left:
3.9l-(10.8)=0
We add all the numbers together, and all the variables
3.9l-10.8=0
We move all terms containing l to the left, all other terms to the right
3.9l=10.8
l=10.8/3.9
l=2+1/1.3
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