This concept shouldn't be all that strange, actually. U-substitution is only one transformation technique, and in fact, you probably have already used other techniques of transformation to solve integration problems that haven't required the U-Substitution method. Here's an example: So this doesn't look too hard.
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Falls Creek, PA Profile: Facts, Map & Data. Falls Creek, Pennsylvania - Basic Facts. The Borough of Falls Creek had a population of 1,003 as of July 1, 2016. The primary coordinate point for Falls Creek is located at latitude 41.142 and longitude -78.8069 in Jefferson County.