Giải phép tính

a) 3 . ( 1/2 - x ) + 1/3 = 7/6 - x

b) 4 . ( 1/2 - x ) - 5 . ( x - 3/10 ) = 7/4

c) -3/2 . ( 4/5 - 2/3 ) + x = 4 . ( x - 1/2 )

d) 2 . ( 3/2 - x ) - 1/3 = 7x - 1/4

e) 1/5 . ( -3/5 -10 ) + 5x = x - 2/3

f) -3/2 . ( 5 - 1/6 ) + 4 . ( x - 1/2 ) = 1