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| Reduce[(5 - 5 x + x^2)^(20 - 9 x + x^2) == 1, x, Integers] gives the full solution set of x={1,2,3,4,5} but the step-by-step solutions (see attached) only show how to find x=1, 4 & 5. The two "missing" solutions are the ones where the base is -1 and,... |