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Автор - polinabasilova13

Помогите пожалуйста! ​

Ответ

Автор - duodaniel200397

1.  9x = 2/5

   x = 2/5 : 9 = 2/5 . 1/9 = 2/45

2.       -3x= 2 1/7

         -3x= 15/7

          x= -15/7 :  3 =  - 15/7 .  1/3 = 5/7

3.        3x-5= 10-x

           4x = 15

           x = 15/4 = 3  3/4

4.          4x + 4 = x + 5

            4x - x  = 5-4

           3x = 1

            x = 1/3

 

5.               7x + 8 = 11

                  7x = 11-8

                7x = 3

              x = 3/7

6.           5x + 9x  + 21 = 35

             14x = 35 -21

             14x = 14

             x = 1

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