5x(2-3x)=4-6x
<=>10x-15x2=4-6x
<=>10x+6x-4-15x2=0
<=>-15x2+16x-4=0
<=>-15(x2-16/15.x+4/15)=0
<=>x2-2/5.x-2/3.x+4/15=0
<=>x(x-2/5)-2/3.(x-2/5)=0
<=>(x-2/3)(x-2/5)=0
<=> x-2/3=0 hoặc x-2/5=0
<=>x=2/3 hoặc x=2/5
5x.(2-3.x)=4-6x
5x(2-3x)=2(2-3x)
5x(2-3x)-2(2-3x)=0
(2-3x)(5x-2)=0
=>2-3x=0 hoặc 5x-2=0
-3x =-2 hoặc 5x=2
x =2/3 hoặc x=2/5
Vậy x=2/3;2/5