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(250*e^-x)/50
(4/3)*pi*r^2-a^3;(4*pi*r^2)/(6*a^2)-x
(4/3)*pi*r^2-a^3;(4*pi*r^2)/(6*a^2)
x+y-50;x+0.2*x+y-(0.1*y)-40
x+y-50;0.8*x+0.9*y-40
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