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ydx+ x 2-4x dy 0
ydx+ x-3y 2 dy 0
y 2dx+ x-1y dy 0
ydx+ 3x-xy+2 dy 0
y 2dx+ xy+x 2 dy 0
xydx+ x 2+y 2 dy 0
y 2dx+ x 2-xy+y 2 dy 0
x x-y dy+y 2dx 0
ydx+ xy+2x-ye y dy 0
ydx-4 x+y 6 dy 0
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