N1 13-100х=0                                      N2 8-0, 8х=0                                      N3  7х-4=х-16                                     N4 1, 3р-11

                                    N1 13-100х=0                                      N2 8-0, 8х=0                                      N3  7х-4=х-16                                     N4 1, 3р-11=0, 8р+5

Ответ:

13-100х=0

-100х=13-0

х=13/(-100)

х=-0,13                                      8-0,8х=0

-0,8х=8-0

х=8/(-0,8)

х=10                                      7х-4=х-16

7х-х=-16+4

6х=-12

х=-12/6

х=-2                                   

1,3р-11=0,8р+5

1,3р-0,8р=5+11

0,5р=16

р=16/0,5

р=32

Ответ #2:

1)

13-100х=0

 -100х=-13

   х=-13:100

     х=-0.13

2)

8-0.8х=0

-0.8х=-8

х=8:(-0.8)

х=10

3)

7х-4=х-16

7х-х=-16+4

6х=-12

х=-12:6

х=-2

4)

1.3р-11=0.8р+5

1.3р-0.8р=5+11

0.5р=16

р=16:0.5

р=32

Источник: https://znanija.com/task/312276