40LK-10L2-5K2
"40LK-10L^2-5K^2"
Assuming "K=1",
We get:
"40L-10L^2-5"
"10L^2-40L+5=0"
Solving the above equation quadratically,
"L=\\frac {40+(1400)^\\frac{1}{2}}{20}"
"L=4"
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