Tìm x: -3/5 + 7/3 (x + 4/3) = -2/15

Tìm x:
a) -3/5 + 7/3 (x + 4/3) = -2/15
b) 2-(2/3-13/4+x)=1/12
c) 2/3x -2/5 =1/2x-1/3