Решебник по математике 6 класс Виленкин Часть 1, 2 Часть 2. Параграф 5. Решение уравнений Задание 123

\[\boxed{\text{5.\ 123}}\]

\[\textbf{а)} - 36x + 660 = - 3x\]

\[- 36x + 3x = - 660\]

\[- 33x = - 660\]

\[x = - 660\ :( - 33)\]

\[x = 20.\]

\[\textbf{б)}\ 9z = - 350 + 4z\]

\[9z - 4z = - 350\]

\[5z = - 350\]

\[z = - 350\ :5\]

\[z = - 70.\]

\[\textbf{в)} - 8x + 83 = 3x - 49\]

\[- 8x - 3x = - 49 - 83\]

\[- 11x = - 132\]

\[x = - 132\ :( - 11)\]

\[x = 12.\]

\[\textbf{г)}\ 43 - 7z = 27 - 9z\]

\[- 7z + 9z = 27 - 43\]

\[2z = - 16\]

\[z = - 16\ :2\]

\[z = - 8.\]

\[\textbf{д)}\ 41 + 23y = 341 + 13y\]

\[23y - 13y = 341 - 41\]

\[10y = 300\]

\[y = 300\ :10\]

\[y = 30.\]

\[\textbf{е)}\ 21x - 34 = 12x - 16\]

\[21x - 12x = - 16 + 34\]

\[9x = 18\]

\[x = 18\ :9\]

\[x = 2.\ \]