2 = 0

bài 1 . tìm x
a, | 3/4x - 3/5 | -1/2 = 0
b. x : -4/9 = 5/8
c, ( 3/5x + 8 ) : 20 = 1
d, -7/12 : x = 4/15
e, 3/4 + 1/4 : x = -3