∴a(x+y-2)+2y-x+5=0
If any value of a in the equation holds, then a(x+y-2)=0 can be analyzed.
So x+y=2.
So the equation 2y-x+5=0 is obtained as follows.
∴x=2y+5
Y=- 1。
x=3
It is verified that no matter what value A takes, the above values of X and Y can make the equation hold (note: the value of A is not equal to 1 and -2).