Ответ:

1) 20+4|5x-3| = 7

4|5x-3| = 7-20

4|5x-3| = -13

1) 4(5X-3) = -13

2)4(5x-3) = 13

1) 20x-12 = -13

20x = -1

x= -1/20 (1)

20x-12 =13

20x = 25

x=4/5