ГДЗ по алгебре 7 класс Макарычев Задание 128

\[\boxed{\text{128\ (128).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[\textbf{а)}\ 5x - 150 = 0\]

\[5x = 150\]

\[x = 150\ :5\]

\[x = 30\]

\[Ответ:x = 30.\]

\[\textbf{б)}\ 48 - 3x = 0\]

\[3x = 48\]

\[x = 48\ :3\]

\[x = 16\]

\[Ответ:x = 16.\]

\[\textbf{в)} - 1,5x - 9 = 0\]

\[- 1,5x = 0 + 9\]

\[- 1,5x = 9\]

\[x = 9\ :( - 1,5)\]

\[x = - 90\ :15\]

\[x = - 6\]

\[Ответ:x = - 6.\]

\[\textbf{г)}\ 12x - 1 = 35\]

\[12x = 35 + 1\]

\[12x = 36\]

\[x = 36\ :12\]

\[x = 3\]

\[Ответ:x = 3.\]

\[\textbf{д)} - x + 4 = 47\]

\[- x = 47 - 4\]

\[- x = 43\]

\[x = - 43\]

\[Ответ:x = - 43.\]

\[\textbf{е)}\ 1,3x = 54 + x\]

\[1,3x - x = 54\]

\[0,3x = 54\]

\[x = 54\ :0,3\]

\[x = 540\ :3\]

\[x = 180\]

\[Ответ:x = 180.\]

\[\textbf{ж)}\ 7 = 6 - 0,2x\]

\[0,2x = 6 - 7\]

\[0,2x = - 1\]

\[x = - 1\ :0,2\]

\[x = - 10\ :2\]

\[x = - 5\]

\[Ответ:x = - 5.\]

\[\textbf{з)}\ 0,15x + 6 = 51\]

\[0,15x = 51 - 6\]

\[0,15x = 45\]

\[x = 45\ :0,15\]

\[x = 4500\ :15\]

\[x = 300\]

\[Ответ:x = 300.\]

\[\textbf{и)} - 0,7x + 2 = 65\]

\[- 0,7x = 65 - 2\]

\[- 0,7x = 63\]

\[x = 63\ :( - 0,7)\]

\[x = - 630\ :7\]

\[x = - 90\]

\[Ответ:x = - 90.\]