`3 xx (x - 1/2) - 5 xx (x + 3/5) = -x + 1/5`
`=> 3 xx x - 3 xx 1/2 - 5 xx x - 5 xx 3/5 = -x + 1/5`
`=> 3 xx x - 3/2 - 5 xx x - 3 = -x + 1/5`
`=> 3 xx x - 5 xx x + x = 1/5 + 3/2 + 3`
`=> (3 - 5 + 1) xx x = 2/10 + 15/10 + 30/10`
`=> -x = 47/10`
`=> x = (-47)/10`
Vậy `x = (-47)/10`
`-5 xx (x + 1/5) - 1/2 xx (x - 2/3) = 3/2 xx ((-5)/6)`
`=> -5 xx x - 5 xx 1/5 - 1/2 xx x + 1/2 xx 2/3 = (-5)/4`
`=> -10/2 xx x - 1 - 1/2 xx x + 1/3 = (-5)/4`
`=> -10/2 xx x - 1/2 xx x = (-5)/4 + 1 - 1/3`
`=> x xx ((-10)/2 - 1/2) = (-15)/12 + 12/12 - 4/12`
`=> x xx (-11)/2 = (-7)/12`
`=> x = (-7)/12 : (-11)/2`
`=> x = 7/66`
Vậy `x = 7/66`
