Tìm x, biết: a) 1/3 - 2x = -1/4; c) -3/7 - 3*x = 4/5 + -2/3

bai 1 : Tinh :
a, 2/3 +3/8 -5/12
b,4/5 -2/3 -1/9
c,-3/8-1/2+1
d, 1/2- -1/7 -1/5
bai 2 tim x , biet
a,1/3-2x= -1/4
b,1/3*x - 4/3
c, -3/7 -3*x=4/5+ -2/3
d, -1/5 +(2*x - 1/2)= -4/5