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y ′′ + 2y ′ + y 0
y ′′ + 2y ′ + 5y 0
y ′′ + y 0
x 2 y ′′ + xy′ + y 0
y'+2y 0
y ′′′ + 4y ′′ + 4y ′ 0
yy′ + x 0
y -2y'-3y 0
y 2-y 0
y +2y'+5y 0
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