(8,4:x+3 5/9):4 1/6=1 1/3
(8,4х+3 5/9):4 1/6=1 1/3, (8 2/5х+32/9):25/6=4/3, (42/5х+32/9):25/6=4/3, 252/125*х+64/75=4/3, 252/125*х=4/3-64/75, 252/125х=100/75-64/75, 252/125х=36/75=12/25, х= 12/25:252/125, х=5/21