Уравнения 4 * (9+7 х) + 21=393,486: (5 х+2) = 18, н

5 (14+б) + 6 б=158

4 * (9 + 7 х) + 21 = 393 486 : (5 х + 2) = 18

36 + 28 х + 21 = 393 5 х + 2 = 486 : 18

28 х = 393 - (36 + 21) 5 х = 27 - 2

28 х = 336 5 х = 25

х = 336 : 28 х = 25 : 5

х = 12 х = 5

5 * (14 + b) + 6b = 158

70 + 5b + 6b = 158

11b = 158 - 70

11b = 88

b = 88 : 11

b = 8

1) 36+28 х+21=393

28 х+57 = 393

28 х = 393 - 57

28 х=336

х = 336 : 28

х = 12

2) 5 х+2 = 486 : 18

5 х + 2 = 27

5 х = 27 - 2

5 х = 25

х = 25 : 5

х = 5

3) 70 + 5 б + 6 б = 158

70+11 б = 158

11 б = 158-70

11 б=88

б=88 : 11

б=8