Ответы: x = 1000; x = 440; x = 280; x = 440; x = 230; x = 50
Решение:
x = 520 + 480
x = 1000
x = 760 - 290
x = 470
x = 540 - 260
x = 280
x = 420 + 20
x = 440
x = 600 - 370
x = 230
x = 900 - 850
x = 50
Ответы: x = 1000; x = 470; x = 280; x = 440; x = 230; x = 50