4x(5x-2)=3(5x-2)
4x(5x-2)-3(5x-2) =0
(4x-3)(5x-2)=0
4x-3=0,5x-2=0
x=3/4,x=2/5
2（x-4）+x(x-4)=0
(2+x)(x-4)=0
2+x=0,x-4=0
x=-2,x=4