2х + 7 = 5х + 13 3х - 23 = 19 - 4х 1,3х + 4,8 = 2,9х - 7,2 2(х-3) - 4(х+1) =5х-38

Question

2х + 7 = 5х + 13 3х - 23 = 19 - 4х 1,3х + 4,8 = 2,9х - 7,2 2(х-3) - 4(х+1) =5х-38

Answer 1

2х + 7 = 5х + 13

2х - 5х = 13 - 7

-3х = 6

х = 6 : (-3)

х = -2

3х - 23 = 19 - 4х

3х + 4х = 19 + 23

7х = 42

х = 42 : 7

х = 6

1,3х + 4,8 = 2,9х - 7,2

1,3х - 2,9х = -7,2 - 4,8

-1,6х = -12

х = -12 : (-1,6)

х = 7,5

2(х-3) - 4(х+1) = 5х - 38

2х - 6 - 4х -4 = 5х - 38

-2х - 10 = 5х - 38

-2х - 5х = -38 + 10

-7х = -28

х = -28 : (-7)

х = 4