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

2x+7=5x+13

2 х-5 х=13-7

-3 х=6

х=6 / (-3)

х=-2

3x-23=19-4x

3 х+4 х=19+23

7 х=42

х=42/7

х=6

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

1,3 х-2,9 х=-7,2-4,8

-1,6 х=-12

х=-12 / (-1,6)

х=7,5

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

4/7 х+1 3/7=6/7 х-40

4/7 х-6/7 х=-40-1 3/7

-2/7 х=-290/7

х=-290/7: (-2/7)

х=145

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

2 х-6-4 х-4=5 х-38

-2 х-10=5 х-38

-2 х-5 х=-38+10

-7 х=-28

х=-28 / (-7)

х=4