6x^2-7x+1=0
(6x-1)(x-1)=0
x1=1/6;x2=1
5x方-18=9x变为
5x^2-9x-18=0
(5x+6)(x-3)=0
x1=-6/5;x2=3
4x^2-3x=52变为
4x^2-3x-52=0
(4x+13)(x-4)=0
x1=-13/4;x2=4