Решебник по математике 6 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 2 | Страница 74

\[Стр.\ 74.\]

\[\boxed{\mathbf{6.}}\]

\[\textbf{а)}\ (2x + 1) + 3x = 11\]

\[2x + 1 + 3x = 11\]

\[5x = 10\]

\[x = 2\]

\[Ответ:2.\]

\[\textbf{б)}\ (x - 5) - (2 - 2x) = 6\]

\[x - 5 - 2 + 2x = 6\]

\[3x - 7 = 6\]

\[3x = 13\]

\[x = 4\frac{1}{3}\ \]

\[Ответ:4\frac{1}{3}.\]

\[\textbf{в)}\ (4x - 1) - (3x + 1) = 2\]

\[4x - 1 - 3x - 1 = 2\]

\[x - 2 = 2\]

\[x = 4\]

\[Ответ:4.\]

\[\textbf{г)} - (3x + 5) + (4 - 7x) = 4\]

\[- 3x - 5 + 4 - 7x = 4\]

\[- 10x - 1 = 4\]

\[- 10x = 5\]

\[x = - \frac{5}{10}\]

\[x = - \frac{1}{2}\]

\[Ответ: - \frac{1}{2}.\]