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[Linear programming] Could u transform the following description into constraints? thanks :)

Transform the description into linear programming constraints:
Example: One and only one action of x and y must happen:
・if-x=1-.
then
Y=o
if-y=1= = then x = 0 } ⇒ x+y= 1
Question:
if x=20₁ then y=o
if x < 20. then y≤ 40
} =>
?

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