Ответ:

Объяснение:

1) x + 3 = - 9x ;

x + 9x = - 3 ;

10x = - 3 ;

x = - 3 : 10 ;

x = - 0,3 .

2) 2x + 2 = - 3 ;

2x = - 3 - 2 ;

2x = - 5 ;

x = - 2,5 .

3) 10x + 9 = 7x ;

10x - 7x = - 9 ;

3x = - 9 ;

x = - 3 .

4) 7 + 8x = - 2x - 5 ;

8x + 2x = - 5 - 7 ;

10x = - 12 ;

x = - 1,2 .

5) x + x/9 = - 10/3 ;│X 9

9x + x = - 30 ;

10x = - 30 ;

x = - 3 .

6) x + x/5 = - 12/5 ;

6x/5 = - 12/5 ;

6x = - 12 ;

x = - 2 .