Đề bài

Tìm x, biết:

a)$x + \frac{3}{5} = \frac{2}{3};$                      

b)$\frac{3}{7} - x = \frac{2}{5};$

c)$\frac{4}{9} - \frac{2}{3}x = \frac{1}{3};$                   

d)$\frac{3}{{10}}x - 1\frac{1}{2} = \left( {\frac{{ - 2}}{7}} \right):\frac{5}{{14}}$