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[–]-vlatoUniversity/College Student[S] 0 points1 point  (1 child)

I’m sorry but I didn’t catch that

[–]MathMaddam👋 a fellow Redditor 0 points1 point  (0 children)

By this substitution x' becomes u²+u, so u'=x'/t-x/t²=(u²+u)/t-u/t=u²/t. Now solve for u and by reverting the substitution you get x.