(2-x)/(x-3) + 1/(3-x）= 1
移项：(2-x)/(x-3) + 1/(3-x）- 1 = 0
统分：(2-x)/(x-3) - 1/(x-3）- (x-3)/(x-3) = 0
{ (2-x) - 1 - (x-3) } /(x-3) = 0
{ -2x +4 } /(x-3) = 0
-2x +4=0
x=2