b) -0,5 -1/3 (5x -1) = 1,5

b) −0,5−135x−1=1,5

13 . 5x−1=−0,5−1,513 . 5x−1=−25x−1=(−2):13

5x – 1 = (–2) . 3

5x – 1 = –6

5x = 1 – 6

5 x = – 5

 x = – 1

Vậy x = – 1.