⅚(⅓х - ⅕) = 3х + 3⅓
(2/3)х - 2/5 = 3х + 10/3
(2/3)х - 3х = 10/3 + 2/5
(10/3) = (50/15)

(2/5) = (6/15)
(2/3)х - (9/15)х = (50/15) + (6/15)
(2/3 - 9/15)х = (50/15 + 6/15)

(10/15 - 9/15)х = 56/15

(1/15)х = 56/15
х = (56/15) * (15/1)

х = 56