Verified answer

Пошаговое объяснение:

№3

5/8*(4/5х - 1,6) + 0,75*(1/3х + 1. 1/3) = 5 - 3х

5/8*(4/5х - 16/10) + 75/100*(1/3х + 4/3) = 5 - 3х

20/40х - 80/80 + 75/300х + 300/300 = 5 - 3х

1/2х - 1 + 1/4х + 1 = 5 - 3х

1/2х + 1/4х = 5 - 3х

2/4х + 1/4х = 5 - 3х

3/4х = 5 - 3х

3/4х + 3х = 5

3. 3/4х = 5

15/4х = 5

х = 5 : 15/4

х = 5 * 4/15

х = 20/15

х = 4/3

х = 1. 1/3

№4

2*(3,5х - 4) - 3*(3х + 1) = 2. 1/7*(7/15х - 1,4)

7х - 8 - 9х - 3 = 15/7*(7/15х - 14/10)

-2х - 11 = 105/105х - 210/70

-2х - 11 = х - 3

-2х - х = -3 + 11

-3х = 8

х = 8 : (-3)

х = -8/3

х = -2. 2/3