Решебник по алгебре 7 класс Мерзляк Задание 60

\[\boxed{\text{60\ (60).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[1)\ (4x + 1) - (7x + 2) = x\]

\[4x + 1 - 7x - 2 - x = 0\]

\[- 4x = 1\]

\[12x - 9 = c + 5\]

\[12 \cdot \left( - \frac{1}{4} \right) - 9 = c + 5\]

\[- 3 - 9 = c + 5\]

\[- 12 - 5 = c\]

\[c = - 17\]

\[Ответ:\ c = - 17.\]

\[2)\ 6 - 3 \cdot (2x - 4) = - 8x + 4\]

\[6 - 6x + 12 = - 8x + 4\]

\[- 6x + 8x = 4 - 6 - 12\]

\[2x = - 14\]

\[\frac{1}{7}cx = x + c\]

\[\frac{1}{7} \cdot ( - 7) \cdot c = - 7 + c\]

\[- c - c = - 7\]

\[- 2c = - 7\]

\[c = \frac{7}{2}\]

\[c = 3,5\]

\[Ответ:c = 3,5.\]