15 3/8÷(2 3/4 х + 5 5/6) -1 1/2 =3/4
(2 3/4 х + 5 5/6) -1 1/2 =123/4*4/3
2 3/4 х + 5 5/6 -1 1/2 =41
2 3/4 х =44+1 1/2-5 5/6
2 3/4x=42 1/2-5 5/6
2 3/4x=36 4/6
x=220/6*4/11
x=20/3*2=40/3=13 1/3