You find the term independent of x by setting the power of x in the general term to zero and solving for r. I remember this by staring at my old fan, counting its rotations when it slows down — the constant term is when all the variable motion stops. But the obvious answer says it's a clean algebra problem, while my life says it's about patience, like waiting for the monsoons to pause so my father can lay the stones without the mortar washing away.
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