`3/2 x - 70 10/11 : (131313/151515 + 131313/353535 + 131313/636363 + 131313/999999) = -5`
`⇔ 3/2 x - 780/11 : (13/15 + 12/35 + 13/63 + 13/99) = -5`
`⇔ 3/2 x - 780/11 : 52/33 = -5`
`⇔ 3/2 x - 45 = -5`
`⇔ 3/2 x = -5 + 45`
`⇔ 3/2 x = 40`
`⇔ x = 80/3`
Vậy `x=80/3`.