457 : 59 = 7,74576271186
7,74576271186 * 59 = 457
272 : 98 = 2,77551020408
2,77551020408 * 98 = 272
495 : 46 =10,7608695652
10,7608695652 * 46 = 494,999999999 (округлили) 495
385 : 65 =5,92307692308
5,92307692308 * 65 = 385
321 : 47 = 6,82978723404
6,82978723404 * 47 = 321
х - 480 =520
х = 520 - 480
х = 40
290 + х = 760
х = 760 - 290
х = 470
540 - х = 260
х = 540 - 260
х = 280
х - 420 = 20
х = 420 + 20
х = 440
х + 370 = 600
х = 600 - 370
х = 230
900 - х = 850
х = 900 - 850
х = 50