Решите уравнения: 1) 80x − 540 = 180; 2) 150 − 630 : x = 60; 3) (260 − x) : 6 = 30; 4) (x : 7) · 50 − 75 = 175; 5) 360 : (85x + 75x) = 6.

1. \(80x - 540 = 180\).
   \(80x = 180 + 540 = 720\).
   \(x = 720 : 80 = 9\).
2. \(150 - 630 : x = 60\).
   \(630 : x = 150 - 60 = 90\).
   \(x = 630 : 90 = 7\).
3. \((260 - x) : 6 = 30\).
   \(260 - x = 30 \cdot 6 = 180\).
   \(x = 260 - 180 = 80\).
4. \((x : 7) \cdot 50 - 75 = 175\).
   \((x : 7) \cdot 50 = 175 + 75 = 250\).
   \(x : 7 = 250 : 50 = 5\).
   \(x = 5 \cdot 7 = 35\).
5. \(360 : (85x + 75x) = 6\).
   \(85x + 75x = 360 : 6 = 60\).
   \(160x = 60\).
   \(x = 60 : 160 = 0.375\).

Ответ: 1) \(x=9\); 2) \(x=7\); 3) \(x=80\); 4) \(x=35\); 5) \(x=0.375\).