6. Реши уравнения: 1 971 + x : 7 = 2 129; 1 224 − x : 6 = 859.

1) \(1971 + x : 7 = 2129\)

\(x : 7 = 2129 - 1971 = 158\)

\(x = 158 · 7 = 1106\)

2) \(1224 - x : 6 = 859\)

\(x : 6 = 1224 - 859 = 365\)

\(x = 365 · 6 = 2190\)

Ответ: 1) \(x = 1106\); 2) \(x = 2190\).