Tìm x, biết: (a) 4/ 5 − x = 1/ 3

(2,0 điểm) Tìm x, biết:

(a) \(\frac{4}{5} - x = \frac{1}{3}\)

(b) \(\frac{{81}}{{625}} = {\left( {\frac{3}{5}} \right)^x}\)

(c) \(\sqrt x = 9\)

(d) \(\left| {\frac{3}{2} + 2x} \right| - 2 = 5,5\).