`(4/(13).6/5+4/(16).2/5).(2x+1)^2=10/13`
`<=> [4/(13).(6/5+2/5)].(2x+1)^2=10/13`
`<=>(4/(13).8/5).(2x+1)^2=10/13`
`<=>32/(65).(2x+1)^2=10/13`
`<=>(2x+1)^2=10/13:32/65`
`<=>(2x+1)^2=25/16`
`<=>2x+1=5/4` hoặc `2x+1=-5/4`
`<=>2x=5/4-1` hoặc `2x=-5/4-1`
`<=>2x=1/4` hoặc `2x=-1/4`
`<=>x=1/4:2` hoặc `x=-1/4:2`
`<=>x=1/8` hoặc `x=-1/8`
vậy `x=1/8` hoặc `x=-1/8`