Задание №3
789 + x = 20 * 30 + 9
x = 600 + 9 - 789
x = 609 - 789
x = - 180;
x - 4340 / 10 = 897 - 203
x - 434 = 897 - 203
x = 897 - 203 + 434
x = 1128;
(384 + 474) - x = 40 * 20
858 - x = 600
- x = 600 - 858
- x = - 258
x = 258;
x + 13 * 50 = 847 + 925
x + 650 = 847 + 925
x = 847 + 925 - 650
x = 1122;