Tìm x biết

Tìm x biết:
1, x + 1/4 = 4/3
2, 3/4 + 2/5x = 29/60
3, 1 3/4 . x + 1 1/2 = -4/5
4, 11/12 - ( 2/5 + x) = 2/3
5, 2 3/4x = 3 1/7 : 0,01
6, 2x . ( x- 1/7 ) = 0
7, 3/4 + 1/4 : x = 2/5
8, 0,25x : 3 = 5/6 : 0,125