ГДЗ по алгебре 7 класс Макарычев Задание 131

\[\boxed{\text{131\ (131).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[\textbf{а)}\ (y + 4) - (y - 1) = 6y\]

\[y + 4 - y + 1 = 6y\]

\[5 = 6y\]

\[y = 5\ :6\]

\[y = \frac{5}{6}\]

\[Ответ:y = \frac{5}{6}.\]

\[\textbf{б)}\ 3p - 1 - (p + 3) = 1\]

\[3p - 1 - p - 3 = 1\]

\[2p = 1 + 4\]

\[2p = 5\]

\[p = 5\ :2\]

\[p = 2,5\]

\[Ответ:p = 2,5.\]

\[\textbf{в)}\ 6x - (7x - 12) = 101\]

\[6x - 7x + 12 = 101\]

\[- x = 101 - 12\]

\[- x = 89\]

\[x = - 89\]

\[Ответ:x = - 89.\]

\[\textbf{г)}\ 20x = 19 - (3 + 12x)\]

\[20x = 19 - 3 - 12x\]

\[20x + 12x = 16\]

\[32x = 16\]

\[x = 16\ :32\]

\[x = 0,5\]

\[Ответ:x = 0,5.\]