Think of a body that is at rest but not in equilibrium.
Difficulty: Easy
Rest implies stationary equilibrium implies a resultant force of zero. Therefore, a body in equilibrium could be moving. For example a skydiver at terminal velocity, where resistive forces are equal to the force of gravity. This means that a body can be in equilibrium and not at rest, but a body at rest must be in equilibrium. Otherwise, it would move so to answer the question: it is impossible.
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