Question

7(х-19)=133; 9(213-2х)=927

Answer 1

=7х-133=133

7х=133+133

7х=266

х=38

 

=1917-18х=927

-18х=-990

х=-990/-18

х=55

Answer 2

7(х-19)=133

7х-133=133

7х=133+133

7х=266

х=266:7

х=38

проверка:7(38-19)=133

                  133=133

 

9(213-2х)=927

1917-18х=927

-18х=927-1917

-18х=- 990

х=-990:(-18)

х=55

проверка:9(213-2*55)=927

                    927=927