Tìm x biết: (3 1/4 : x).(-1/2) = -5/3 - 5/6

a) (3¼ ÷x)×(-½)=-5/3-5/6
b) -1/4-3/4÷×=-11/36
c) 5/7+2/3.×=3/10
d) 3/4 .x - 1/2 =3/7
e) (×-1/2)÷1/3+5/7=9/5/7