Question

Решить уравнения: 2x+7=5x+13; 3x-23=19-4x; 1,3x+4,8=2,9x-7,2; 4/7x+1 3/7=6/7x-5 5/7*7; 2(x-3)-4(x+1)=5x-38

Answer 1

2x+7=5x+13

2х-5х=13-7

-3х=6

х=6/(-3)

х=-2

 

3x-23=19-4x

3х+4х=19+23

7х=42

х=42/7

х=6

 

1,3x+4,8=2,9x-7,2

1,3х-2,9х=-7,2-4,8

-1,6х=-12

х=-12/(-1,6)

х=7,5

 

4/7x+1 3/7=6/7x-5 5/7*7

4/7х+1 3/7=6/7х-40

4/7х-6/7х=-40-1 3/7

-2/7х=-290/7

х=-290/7:(-2/7)

х=145

 

2(x-3)-4(x+1)=5x-38

2х-6-4х-4=5х-38

-2х-10=5х-38

-2х-5х=-38+10

-7х=-28

х=-28/(-7)

х=4