Question

,Решите уравнения: 1) 84а+25а+7=443 2) 4(9+7х)+21=393

Answer 1

1)84а+25а+7=443       2)4(9+7х)+21=393

109а+7=443                  36+28х+21=393

109а=443-7                     28х+57=393

109а=436                        28х=393-57

а=436:109                       28х=336

а=4                                    х=336:28

                                         х=12

Answer 2

84а+25а+7=443 109а=443-7 109а=436 а=436:109 а=4. 4(9+7х)+21=393 36+28х+21=393 28х=393-21-36 28х=336 х=336:28 х=12