When a student solves the equation, 2x minus 1 is equal to x plus a minus 1. When the denominator is removed, the negative one on the right side of the equation is not multiplied by 3. Therefore, he obtains the solution of the equation as x = 2 and the value of A

(2x-1)/3=(x+a)/3-1
If - 1 is not multiplied by 3, then the equation is: 2x-1 = x + A-1 ①
If x = 2 generations, we can get 4-1 = 2 + A-1 and a = 2

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