a) x + 5,84 = 9,16

               x = 9,16 - 5,84

               x = 3,32.

So x = 3,32

Vậy x = 3,32

b) x - 0,35 = 2,55  

              x = 2,55 + 0,35

              x = 2,9.

So x = 2,9

Vậy x = 2,9