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plot (0.65x+1.3*0.4(1-x))/(0.65x+0.4(1-x)), (1.125*0.65x+0.4(1-x))/(0.65x+0.4(1-x)), x in (0,1)
plot (0.65x+1.3*0.4(1-x))/(0.65x+0.4(1-x)), (1.125*0.65x+0.4(1-x))/(0.65x+0.4(1-x)), x in (0,1)
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