(1 5/6х+3 1/5)*1/2=3,85

(1 5/6 * х + 3 1/5) * 1/2 = 3,85;

(1 * 6 + 5)/6 * х + (3 * 5 + 1)/5 = 385/100 : 1/2;

11/6 * х + 16/5 = 385/100 * 2;

11/6 * х + 16/5 = 77/20 * 2;

11/6 * х = 77/10 - 16/5;

11/6 * х = 77/10 - 32/10;

х = (77 - 32)/10 : 11/6 = 45/10 * 6/11 = (45 * 6)/(10 * 11) = 27/11;

Ответ: х = 27/11.