Tìm x

a, x+ 1/2 = 3/5
b, x -1/4 = -7/2
c, 2/3 : x = -1/3
d, x + 2/3 = -1/12 . -4/5
e, 3/5.x-1/3=1/4
f, 1/4 + 3/4 : x = -2
m, 5,6 + x = 2,4
n, 2x - 0,75 = -0,5