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2l+2(l-4.5)=73
We move all terms to the left:
2l+2(l-4.5)-(73)=0
We multiply parentheses
2l+2l-9-73=0
We add all the numbers together, and all the variables
4l-82=0
We move all terms containing l to the left, all other terms to the right
4l=82
l=82/4
l=20+1/2
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