help
5x-1= 2

|5x-1|=21


Răspuns :

5x-1= 2 <=> 5x = 2+1 => x = 3/5

|5x-1|=21   <=> 5x-1 = 21 => 5x = 22 => x = 22/5

                       -5x+1 = 21 => 5x = 1-21 => x = -20/5 => x = -4