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l/2-7=-11
We move all terms to the left:
l/2-7-(-11)=0
We add all the numbers together, and all the variables
l/2+4=0
We multiply all the terms by the denominator
l+4*2=0
We add all the numbers together, and all the variables
l+8=0
We move all terms containing l to the left, all other terms to the right
l=-8
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