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plot (50/(1+(x-7)*0.6)-112.4/(1+x*0.6))/(1.405/(1+x*0.6)-1/(1+x*0.6)) from x=7 to 40
plot (50/(1+(x-7)*0.6)-112.4/(1+x*0.6))/(1.405/(1+x*0.6)-1/(1+x*0.6)) from x=7 to 40
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