4x-7=2x+15

7x+12=10x-3

11-х=55+x

-35-2x=42+9x

1) 4x-7=2x+15

4x-2x=15+7

2x=22

x=11

2) 7x+12=10x-3

7x-10x=-3-12

-3x=-15

x=5

3) 11-x=55+x

-x-x=55-11

-2x=44

x=-22

4) - 35-2x=42+9x

-2x-9x=42+35

-11x=77

x=-7

1) 4x - 7 = 2x + 15

4x - 2x = 15 + 7

2x = 22

x = 11

2) 7x + 12 = 10x - 3

7x - 10x = - 3 - 12

-3x = - 15

x = 5

3) 11 - x = 55 + x

-x - x = 55 - 11

-2x = 44

x = - 22

4) - 35 - 2x = 42 + 9x

-2x - 9x = 42 + 35

- 11x = 77

x = - 7