Tìm x, biết: a) (x- 5.9).2 = 0; b) 21. (32 - x) = 21; c) 25.(2.x - 4).12 = 0

a) (x- 5.9).2 = 0;

 x- 5.9 =0

x = 45

b) 21. (32 - x) = 21

32 - x = 1

x = 31

c) 25.(2.x - 4).12 = 0

2.x - 4 = 0

2. x = 4

x = 2

d) (x- 4) : 6 - 5 = 10

(x- 4) : 6 = 15

x - 4 = 90

x = 94