Hint: Consider all possible remainders when x is divided by 3.
Hi, I have the following problem. I think I know how to solve the second part (I have done 2 other problems that look very similar), however, I have no clue about the first part :-/. Thanks for your help!
Part 1 (the one I have no clue about): Prove that the equation has no solution with in .
Part 2 (which I think I know): Then use this to prove that the equation has no solution with and in