Đề bài

Tìm x, biết:

a) $\dfrac{3}{4} + \dfrac{1}{9}:x = 0,5$

b) $\dfrac{3}{4} - \left( {x - \dfrac{2}{3}} \right) = 1\dfrac{1}{3}$

c) $\left( {\dfrac{5}{7} - x} \right).\dfrac{{11}}{{15}} = \dfrac{{ - 22}}{{45}}$

d) $\left( {2,5x - \dfrac{4}{7}} \right):\dfrac{8}{{21}} =  - 1,5$