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40l+7.50l=12.50
We move all terms to the left:
40l+7.50l-(12.50)=0
We add all the numbers together, and all the variables
40l+7.50l-(12.5)=0
We add all the numbers together, and all the variables
47.5l-12.5=0
We move all terms containing l to the left, all other terms to the right
47.5l=12.5
l=12.5/47.5
l=8.3333333333333/31.666666666667
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