Tìm x, biết

Tìm x biết
a)x.3/7=2/3
b)x:8/11=11/3
c)2/5:x=-1/4
d)4/7.x-2/3=1/5
e)2/9-7/8.x=1/3
g)4/5+5/7:x=1/6