ГДЗ по алгебре 8 класс Макарычев Задание 70

\[\boxed{\text{70\ (70).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[15x - 12 - 8x = 4x + 9\]

\[7x - 12 = 4x + 9\]

\[7x - 4x = 9 + 12\]

\[3x = 21\]

\[x = 7\]

\[Ответ:\ x = 7.\]

\[19x - 8x + 24 = 66 - 3x\]

\[11x + 3x = 66 - 24\]

\[14x = 42\]

\[x = 3\]

\[Ответ:\ x = 3.\]

\[0,14x - 1 + 0,02 = 1,4x - 2,24\]

\[0,14x - 0,98 = 1,4x - 2,24\]

\[0,14x - 1,4x = - 2,24 + 0,98\]

\[- 1,26x = - 1,26\]

\[x = 1\]

\[Ответ:\ x = 1.\]

\[0,27x + 8,64 + 0,78 - 0,6x =\]

\[= 16,02\]

\[- 0,33x = 16,02 - 8,64 - 0,78\]

\[- 0,33x = 6,6\]

\[x = 6,6\ :( - 0,33)\]

\[x = - 20\]

\[Ответ:\ x = - 20.\]