(x- 1)(x-4)a=(x+4)(x-4)
There is no solution for any A.
Look at the coefficient of a first. If you take 0 and the right side is not 0, he has no solution to any A.
X takes 1, which is a solution.
On second thought, when x takes 4 from 4, it always holds.
13 minutes ago, when taking -4, left non-0 and right 0 never wanted to wait.
12 minutes ago, so X can choose B with 1 and -4.