solve : dy/dx + y = x
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Earth is Not Flat, We see the earth flat because its very big. Earth is Spherical shaped, for example:- when you see a boat at sea/ocean and gets further away you see that its becomes to sink and gets out of sight, and one more thing if your use binoculars you can still see the boat's half only.
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A machine is a human-made device that uses power to apply forces and control movement to perform an action.
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