Suppose a horse is pulling a cart refuses to do so under the following argument. "If I pull the cart to the right, there will be an equal but opposite force on the cart to the left and the net force on the cart will be zero. According to the first law of Newton, if the cart is at rest, it shall remain at rest. So the cart will never move no matter how much I pull on it". What is wrong with this argument?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!